Guide to Citation File Format schema version 1.2.0

General structure of a `CITATION.cff` file

Valid Citation File Format files

must be named CITATION.cff (note the capitalization);
are valid according to the Citation File Format schema version 1.2.0 outlined in schema.json;
are valid YAML 1.2 (specification, validator).

String quoting: Note that in YAML you generally don't need to quote strings. But you should use " quotes when a string value contains whitespace, contains special characters (e.g., any of :{}[],&*#?|-<>=!%, or any of ` and @ at the beginning), consists only of numbers (e.g., is the string "42", not the number 42), or is "true", "false", "yes" or "no".

In short: When a string value doesn't behave as expected, try putting it in " quotes.

Minimal example

A minimal example of a valid CITATION.cff file, that contains only the required keys, could look like this:

authors:
  - family-names: Druskat
    given-names: Stephan
cff-version: 1.2.0
message: "If you use this software, please cite it using these metadata."
title: "My Research Software"

Typical example

For most software however, it is relatively easy to expand the minimal case with important information like the version, the date when it was last published, some keywords, etc.:

abstract: "This is my awesome research software. It does many things."
authors:
  - family-names: Druskat
    given-names: Stephan
    orcid: "https://orcid.org/0000-0003-4925-7248"
cff-version: 1.2.0
date-released: "2021-07-18"
identifiers:
  - description: "This is the collection of archived snapshots of all versions of My Research Software"
    type: doi
    value: 10.5281/zenodo.123456
  - description: "This is the archived snapshot of version 0.11.2 of My Research Software"
    type: doi
    value: 10.5281/zenodo.123457
keywords:
  - "awesome software"
  - research
license: Apache-2.0
message: "If you use this software, please cite it using these metadata."
repository-code: "https://github.com/citation-file-format/my-research-software"
title: "My Research Software"
version: 0.11.2

Referencing other work

When your software or data builds on what others have already done, it is good practice to add a references section to your CITATION.cff file. This way, you give credit to the authors of works that your own work builds on.

The references section works like a reference list in a paper, but can also contain references to other software (such as the dependencies of your software), other datasets, and other (research) outputs.

authors:
  - family-names: Druskat
    given-names: Stephan
cff-version: 1.2.0
message: "If you use this software, please cite it using these metadata."
references:
  - authors:
      - family-names: Spaaks
        given-names: "Jurriaan H."
    title: "The foundation of Research Software"
    type: software
  - authors:
      - family-names: Haines
        given-names: Robert
    title: "Ruby CFF Library"
    type: software
    version: 1.0
title: "My Research Software"

Credit redirection

Sometimes you want to redirect any credit your work may receive towards a second work (typically one of your own). A common example is, that when you write software and then write a paper about it, you may want to be credited for the paper instead of for the software itself. For this case, your CITATION.cff should contain metadata about the software at the root of the CITATION.cff file, but additionally, you can add a preferred-citation key with the metadata of the paper (or other work) you want people to cite. Usually, the message also reflects the authors' wishes on how they want to be credited.

authors:
  - family-names: Druskat
    given-names: Stephan
cff-version: 1.2.0
message: "If you use this software, please cite both the article from preferred-citation and the software itself."
preferred-citation:
  authors:
    - family-names: Druskat
      given-names: Stephan
  title: "Software paper about My Research Software"
  type: article
title: "My Research Software"

The next sections explain each key in more detail.

Valid keys

This section describes the valid keys in a CITATION.cff file.

Index

abstract
authors (array of objects)
cff-version
commit
contact (object)
date-released
doi
identifiers (array of objects)
keywords
license
license-url
message
preferred-citation (object)
references (array of objects)
repository
repository-artifact
repository-code
title
type
url
version

`abstract`

type: Nonempty string
required: false
description: A description of the software or dataset.

usage:

abstract: This software implements methods to do things.

`authors`

type: Array of definitions.person and/or definitions.entity objects.
required: true
description: The authors of a software or dataset. (See also How to deal with unknown individual authors?)

usage:

authors:
  - given-names: Stephan
    family-names: Druskat

authors:
  - name: "The Research Software project"

authors:
  - given-names: Stephan
    family-names: Druskat
  - name: "The Research Software project"

`cff-version`

type: Nonempty string
required: true
description: The Citation File Format schema version that the CITATION.cff file adheres to for providing the citation metadata.
usage:
```
cff-version: 1.2.0
```
```
cff-version: "1.2.0"
```

`commit`

type: Nonempty string
required: false
description: The commit hash or revision number of the software version.

usage:

commit: 1ff847d81f29c45a3a1a5ce73d38e45c2f319bba

commit: "Revision: 8612"

`contact`

type: Array of definitions.person and/or definitions.entity objects.
required: false
description: The contact person, group, company, etc. for the software or dataset.

usage:

contact:
  - affiliation: "German Aerospace Center (DLR)"
    email: mail@research-project.org
    family-names: Druskat
    given-names: Stephan

contact:
  - email: mail@research-project.org
    name: "The Research Software project"

contact:
  - email: mail@research-project.org
    family-names: Druskat
    given-names: Stephan
  - email: mail@research-project.org
    name: "The Research Software project"

`date-released`

type: definitions.date
required: false
description: The date the software or data set has been released. Format is 4-digit year, 2-digit month, 2-digit day of month, separated by dashes.
usage:
```
date-released: "2020-01-31"
```

`doi`

type: definitions.doi
required: false

description: The DOI of the software or dataset. This notation is most useful when there is just one DOI you want to include. In that case, doi can be used as shorthand for something like:

identifiers:
  - description: "The concept DOI of the work."
    type: doi
    value: 10.5281/zenodo.1003149

or

identifiers:
  - description: "The versioned DOI of the work."
    type: doi
    value: 10.5281/zenodo.4813122

usage:

doi: 10.5281/zenodo.1003149

doi: "10.5281/zenodo.4813122"

`identifiers`

type: Array of definitions.identifier objects.
required: false
description: The identifiers of the software or dataset.

usage:

identifiers:
  - description: "The concept DOI of the work."
    type: doi
    value: 10.5281/zenodo.1003149

identifiers:
  - description: "The versioned DOI for version 1.1.0 of the work."
    type: doi
    value: 10.5281/zenodo.4813122

identifiers:
  - description: "The concept DOI of the work."
    type: doi
    value: 10.5281/zenodo.1003149
  - description: "The versioned DOI for version 1.1.0 of the work."
    type: doi
    value: 10.5281/zenodo.4813122

identifiers:
  - description: "The concept DOI of the work."
    type: doi
    value: 10.5281/zenodo.1003149
  - description: "The versioned DOI for version 1.1.0 of the work."
    type: doi
    value: 10.5281/zenodo.4813122
  - description: "The Software Heritage identifier for version 1.1.0 of the work."
    type: swh
    value: "swh:1:dir:bc286860f423ea7ced246ba7458eef4b4541cf2d"
  - description: "The GitHub release URL of tag 1.1.0."
    type: url
    value: "https://github.com/citation-file-format/citation-file-format/releases/tag/1.1.0"
  - description: "The GitHub release URL of the commit tagged with 1.1.0."
    type: url
    value: "https://github.com/citation-file-format/citation-file-format/tree/16192bf05e99bcb35d5c3e085047807b5720fafc"

`keywords`

type: Array of nonempty string
required: false
description: Keywords that describe the work.

usage:

keywords:
 - thefirstkeyword
 - thesecondkeyword
 - "a third keyword"

`license`

type: (Array of) definitions.license-enum.
required: false
description: The SPDX license identifier(s) for the license(s) under which the work is made available. When there are multiple licenses, it is assumed their relationship is OR, not AND.

usage:

license: Apache-2.0

license:
 - Apache-2.0
 - MIT

license:
 - GPL-3.0
 - GPL-3.0-or-later

`license-url`

type: definitions.url
required: false
description: The URL of the license text under which the software or dataset is licensed (only for non-standard licenses not included in the SPDX License List).

usage:

license-url: "https://obscure-licenses.com?id=1234"

`message`

type: Nonempty string
required: true
default: If you use this software, please cite it using the metadata from this file.
description: A message to the human reader of the CITATION.cff file to let them know what to do with the citation metadata.

usage:

message: "If you use this software, please cite it using the metadata from this file."

message: "Please cite this software using these metadata."

message: "Please cite this software using the metadata from 'preferred-citation'."

message: "If you use this dataset, please cite it using the metadata from this file."

message: "Please cite this dataset using these metadata."

message: "Please cite this dataset using the metadata from 'preferred-citation'."

`preferred-citation`

type: A definitions.reference object.
required: false
description: A reference to another work that should be cited instead of the software or dataset itself. Note that the principles of software citation and data citation require that software should be cited on the same basis as any other research product such as a paper or a book. Adding a different preferred citation may result in a violation of the respective primary principle, "Importance", when others cite this work.

usage:

preferred-citation:
  authors:
    - family-names: Famnames
      given-names: "Given Nam E."
  title: "Title of the work."
  type: generic
  year: 2021

`references`

type: Array of definitions.reference objects.
required: false
description: Reference(s) to other creative works. Similar to a list of references in a paper, references of the software or dataset may include other software (dependencies), or other research products that the software or dataset builds on, but not work describing the software or dataset.

usage:

references:
  - authors:
      - name: "The Dependency Project"
    date-released: "2021-07-26"
    doi: 10.5281/zenodo.x1234567
    repository-code: "https://github.com/dependency-project/dependency"
    title: Dependency
    type: software
    version: 0.13.4
  - authors:
      - family-names: Bielefeld
        given-names: Arthur
        name-particle: von
    doi: 10.9999/hardscifi-lang.42132
    issue: 13
    journal: "Journal of Hard Science Fiction"
    scope: "Cite this paper if you want to reference the general concepts of the software."
    title: "Towards a 100% accuracy syntax parser for all languages"
    type: article
    volume: 42
    year: 2099

`repository`

type: definitions.url
required: false
description: The URL of the software or dataset in a repository/archive (when the repository is neither a source code repository nor a build artifact repository).
usage:
```
repository: "https://ascl.net/2105.013"
```

`repository-artifact`

type: definitions.url
required: false
description: The URL of the work in a build artifact/binary repository (when the work is software).

usage:

repository-artifact: "https://search.maven.org/artifact/org.corpus-tools/cff-maven-plugin/0.4.0/maven-plugin"

`repository-code`

type: definitions.url
required: false
description: The URL of the work in a source code repository.

usage:

repository-code: "https://github.com/citation-file-format/cff-converter-python"

`title`

type: Nonempty string
required: true
description: The name of the software or dataset.
usage:
```
title: "cffconvert"
```

`type`

type: enum (software or dataset)
default: software
required: false
description: The type of the work that is being described by this CITATION.cff file.
usage:
```
type: software
```
```
type: dataset
```

`url`

type: definitions.url
required: false
description: The URL of a landing page/website for the software or dataset.

usage:

url: "https://citation-file-format.github.io/"

`version`

type: definitions.version
required: false
description: The version of the software or dataset.

usage:

version: "1.2.0"

version: 1.2

version: "21.10 (Impish Indri)"

Definitions

Some values in CFF files are valid in different keys. For example, repository-code, url and license-url all take URLs as values.

The schema therefore has definitions of smaller subschemas, that can be reused in the schema from the respective key, instead of having to duplicate them. For example, there is one definition for a valid URL value (definitions.url), that is being referenced from repository-code, url and license-url.

Note: definitions and its subkeys like definitions.alias or definitions.entity.alias should not be used as keys in CITATION.cff files:

# incorrect
authors:
  - definitions.alias: sdruskat

# incorrect
authors:
  - definitions:
      alias: sdruskat

# correct
authors:
  - alias: sdruskat

Index

definitions.address
definitions.alias
definitions.city
definitions.commit
definitions.country
definitions.date
definitions.doi
definitions.email
definitions.entity (object)
definitions.fax
definitions.identifier (object)
definitions.identifier-description
definitions.license
definitions.license-enum
definitions.orcid
definitions.person (object)
definitions.post-code
definitions.reference (object)
definitions.region
definitions.swh-identifier
definitions.tel
definitions.url
definitions.version

`definitions.address`

type: Nonempty string
required: N/A
description: An address.

usage:

authors:
  - name: "The Research Software Project"
    address: "742 Evergreen Terrace"

`definitions.alias`

type: Nonempty string
required: N/A
description: An alias.

usage:

authors:
  - name: "The Research Software Project"
    alias: "RSP"

`definitions.city`

type: Nonempty string
required: N/A
description: A city.

usage:

authors:
  - name: "The Research Software Project"
    city: "Berlin"

`definitions.commit`

type: Nonempty string
required: N/A
description: The (e.g., Git) commit hash or (e.g., Subversion) revision number of the work.

usage:

commit: "1ff847d81f29c45a3a1a5ce73d38e45c2f319bba"

commit: "Revision: 8612"

`definitions.country`

type: enum with values
- AD
- AE
- AF
- AG
- AI
- AL
- AM
- AO
- AQ
- AR
- AS
- AT
- AU
- AW
- AX
- AZ
- BA
- BB
- BD
- BE
- BF
- BG
- BH
- BI
- BJ
- BL
- BM
- BN
- BO
- BQ
- BR
- BS
- BT
- BV
- BW
- BY
- BZ
- CA
- CC
- CD
- CF
- CG
- CH
- CI
- CK
- CL
- CM
- CN
- CO
- CR
- CU
- CV
- CW
- CX
- CY
- CZ
- DE
- DJ
- DK
- DM
- DO
- DZ
- EC
- EE
- EG
- EH
- ER
- ES
- ET
- FI
- FJ
- FK
- FM
- FO
- FR
- GA
- GB
- GD
- GE
- GF
- GG
- GH
- GI
- GL
- GM
- GN
- GP
- GQ
- GR
- GS
- GT
- GU
- GW
- GY
- HK
- HM
- HN
- HR
- HT
- HU
- ID
- IE
- IL
- IM
- IN
- IO
- IQ
- IR
- IS
- IT
- JE
- JM
- JO
- JP
- KE
- KG
- KH
- KI
- KM
- KN
- KP
- KR
- KW
- KY
- KZ
- LA
- LB
- LC
- LI
- LK
- LR
- LS
- LT
- LU
- LV
- LY
- MA
- MC
- MD
- ME
- MF
- MG
- MH
- MK
- ML
- MM
- MN
- MO
- MP
- MQ
- MR
- MS
- MT
- MU
- MV
- MW
- MX
- MY
- MZ
- NA
- NC
- NE
- NF
- NG
- NI
- NL
- NO
- NP
- NR
- NU
- NZ
- OM
- PA
- PE
- PF
- PG
- PH
- PK
- PL
- PM
- PN
- PR
- PS
- PT
- PW
- PY
- QA
- RE
- RO
- RS
- RU
- RW
- SA
- SB
- SC
- SD
- SE
- SG
- SH
- SI
- SJ
- SK
- SL
- SM
- SN
- SO
- SR
- SS
- ST
- SV
- SX
- SY
- SZ
- TC
- TD
- TF
- TG
- TH
- TJ
- TK
- TL
- TM
- TN
- TO
- TR
- TT
- TV
- TW
- TZ
- UA
- UG
- UM
- US
- UY
- UZ
- VA
- VC
- VE
- VG
- VI
- VN
- VU
- WF
- WS
- YE
- YT
- ZA
- ZM
- ZW
required: N/A
description: The ISO 3166-1 alpha-2 country code for a country.

usage:

authors:
  - country: NL
    name: "The Authors Team"

references:
  - conference:
      country: DE
    type: conference

`definitions.date`

type: Nonempty string
required: N/A
description: A date. Format is 4-digit year, followed by 2-digit month, followed by 2-digit day of month, and separated by dashes. Note to tool implementers: it is necessary to cast YAML date objects to string objects when validating against the schema.

usage:

date-released: "2020-01-31"

references:
  - date-accessed: "2020-01-31"
    type: generic

references:
  - date-downloaded: "2020-01-31"
    type: generic

references:
  - date-published: "2020-01-31"
    type: generic

references:
  - date-released: "2020-01-31"
    type: generic

references:
  - conference:
        date-end: "2020-02-02"
        date-start: "2020-01-31"
    type: conference

`definitions.doi`

type: Nonempty string
required: N/A
description: The DOI of the work (i.e., 10.5281/zenodo.1003150, not the resolver URL http://doi.org/10.5281/zenodo.1003150).
usage:
```
doi: 10.5281/zenodo.1003150
```

`definitions.email`

type: Nonempty string
required: N/A
description: An email address.

usage:

authors:
  - email: "mail@research-project.org"
    name: "The Research Software project"

`definitions.entity`

type: object with the following keys:
- address
- alias
- city
- country
- date-end
- date-start
- email
- fax
- location
- name
- orcid
- post-code
- region
- tel
- website
required: N/A
description: An entity. Entities are used in keys that can also take definitions.person objects. An entity can represent different types of entities, such as a team, an institution, a company, a conference, etc.

usage:

authors:
  - address: "742 Evergreen Terrace"
    alias: RSP
    city: Berlin
    country: DE
    date-end: "2018-07-27"
    date-start: "2021-07-27"
    email: team@research-project.org
    fax: +12-3456-7890
    location: "Lovelace Building, room 0.42"
    name: "The Research Software Project"
    orcid: "https://orcid.org/0000-0003-4925-7248"
    post-code: 90210
    region: Renfrewshire
    tel: +12-345-6789098
    website: "https://research-software-project.org"

contact:
  - name: "The Research Software Project team"

references:
  - type: generic
    title: "A reference showing different keys that take entity objects"
    authors:
      - name: "The Research Software Project team"
    conference:
      name: "RC21 - Research Conference 2021"
    contact:
      - name: "Customer Support"
    database-provider:
      name: "Database Provider"
    editors:
      - name: "The Publication Editing Team"
    editors-series:
      - name: "The Publication Series Editing Team"
    institution:
      name: "Department of Research, Random University"
    location:
      name: "Museum of Postmodern Art"
    publisher:
      name: "Open Access Publishing House"
    recipients:
      - name: "The recipient institution of a personal communication"
    senders:
      - name: "The team sending a personal communication"
    translators:
      - name: "Research Translators, Ltd."

`definitions.entity.address`

type: definitions.address.
required: false
description: The entity's address.

usage:

authors:
  - address: "742 Evergreen Terrace"
    name: "The Research Software Project"

`definitions.entity.alias`

type: definitions.alias.
required: false
description: The entity's alias.

usage:

authors:
  - alias: NASA
    name: "National Aeronautics and Space Administration"

`definitions.entity.city`

type: definitions.city.
required: false
description: The entity's city.

usage:

authors:
  - city: Berlin
    name: "The Research Software Project"

`definitions.entity.country`

type: definitions.country.
required: false
description: The entity's country.

usage:

authors:
  - name: "The Research Software Project"
    country: DE

`definitions.entity.date-end`

type: definitions.date.
required: false
description: The entity's ending date, e.g. when the entity is a conference.

usage:

references:
  - authors:
      - name: "The Research Software Project"
    conference:
      date-end: "2021-07-27"
      name: "Research Conference 2021"
    title: "Conference Paper"
    type: conference-paper

`definitions.entity.date-start`

type: definitions.date.
required: false
description: The entity's starting date, e.g. when the entity is a conference.

usage:

references:
  - type: conference-paper
    title: "Conference Paper"
    authors:
      - name: "The Research Software Project"
    conference:
      name: "Research Conference 2021"
      date-start: "2021-07-27"

`definitions.entity.email`

type: definitions.email.
required: false
description: The entity's email address.

usage:

authors:
- email: team@research-project.org
  name: "The Research Software Project"

`definitions.entity.fax`

type: definitions.fax.
required: false
description: The entity's fax number.

usage:

authors:
  - fax: +12-3456-7890
    name: "The Research Software Project"

`definitions.entity.location`

type: Nonempty string
required: false
description: The entity's location.

usage:

authors:
  - location: "Lovelace Building, room 0.42"
    name: "The Research Software Project"

`definitions.entity.name`

type: Nonempty string
required: true
description: The entity's name.

usage:

authors:
  - name: "The Research Software Project"

`definitions.entity.orcid`

type: definitions.orcid.
required: false
description: The entity's ORCID identifier.

usage:

authors:
  - name: "The Research Software Project"
    orcid: "https://orcid.org/0000-0003-4925-7248"

`definitions.entity.post-code`

type: definitions.post-code.
required: false
description: The entity's post code.

usage:

authors:
  - name: "The Research Software Project"
    post-code: 90210

authors:
  - name: "The Research Software Project"
    post-code: "90210"

`definitions.entity.region`

type: definitions.region.
required: false
description: The entity's region.

usage:

authors:
  - name: "The Research Software Project"
    region: Renfrewshire

`definitions.entity.tel`

type: definitions.tel.
required: false
description: The entity's telephone number.

usage:

authors:
  - name: "The Research Software Project"
    tel: +12-345-6789098

`definitions.entity.website`

type: definitions.url.
required: false
description: The entity's website.

usage:

authors:
  - name: "The Research Software Project"
    website: "https://research-software-project.org"

`definitions.fax`

type: Nonempty string
required: N/A
description: A fax number.

usage:

authors:
  - name: "The Research Software Project"
    fax: +12-3456-7890

authors:
  - family-names: Druskat
    fax: +12-3456-7890
    given-names: Stephan

`definitions.identifier`

type: One of the following object types (click to expand/collapse):
1. DOI
  - type:
    - type: enum with singular value doi
    - required: true
    - description: The type of identifier.
  - value:
    - type: definitions.doi
    - required: true
    - description: The value of the DOI, e.g. 10.5281/zenodo.1003149
  - description:
    - type: definitions.identifier-description
    - required: false
    - description: The description of the DOI, e.g. This is the DOI for version 0.11.4.
2. URL
  - type:
    - type: enum with singular value url
    - required: true
    - description: The type of identifier.
  - value:
    - type: definitions.url
    - required: true
    - description: The value of the URL, e.g. https://github.com/citation-file-format/citation-file-format.
  - description:
    - type: definitions.identifier-description
    - required: false
    - description: The description of the URL, e.g. The homepage for the project.
3. Software Heritage identifier
  - type:
    - type: enum with singular value swh
    - required: true
    - description: The type of identifier.
  - value:
    - type: definitions.swh-identifier
    - required: true
    - description: The value of the Software Heritage identifier, e.g. swh:1:dir:bc286860f423ea7ced246ba7458eef4b4541cf2d.
  - description:
    - type: definitions.identifier-description
    - required: false
    - description: The description of the Software Heritage identifier, e.g. The directory object of the repository as stored on Software Heritage..
4. Other
  - type:
    - type: enum with singular value other
    - required: true
    - description: The type of identifier.
  - value:
    - type: Nonempty string.
    - required: true
    - description: The value of the identifier, e.g. arXiv:2103.06681.
  - description:
    - type: definitions.identifier-description
    - required: false
    - description: The description of the identifier, e.g. The ArXiv preprint of the paper..
required: N/A
description: An identifier.

usage:

identifiers:
  - type: doi
    value: 10.5281/zenodo.1003149
    description: "The concept DOI of the work."

identifiers:
  - type: doi
    value: 10.5281/zenodo.4813122
    description: "The versioned DOI for version 1.1.0 of the work."

identifiers:
  - type: doi
    value: 10.5281/zenodo.1003149
    description: "The concept DOI of the work."
  - type: doi
    value: 10.5281/zenodo.4813122
    description: "The versioned DOI for version 1.1.0 of the work."

identifiers:
  - type: doi
    value: 10.5281/zenodo.1003149
    description: "The concept DOI of the work."
  - type: doi
    value: 10.5281/zenodo.4813122
    description: "The versioned DOI for version 1.1.0 of the work."
  - type: swh
    value: "swh:1:dir:bc286860f423ea7ced246ba7458eef4b4541cf2d"
    description: "The Software Heritage identifier for version 1.1.0 of the work."
  - type: url
    value: "https://github.com/citation-file-format/citation-file-format/releases/tag/1.1.0"
    description: "The GitHub release URL of tag 1.1.0."
  - type: url
    value: "https://github.com/citation-file-format/citation-file-format/tree/16192bf05e99bcb35d5c3e085047807b5720fafc"
    description: "The GitHub release URL of the commit tagged with 1.1.0."

preferred-citation:
  identifiers:
    - type: other
      value: "arXiv:2103.06681"
      description: The ArXiv preprint of the paper

`definitions.identifier-description`

type: Nonempty string
required: N/A
description: A description for a specific identifier value.

usage:

doi: 10.5281/zenodo.4813121
identifiers:
  - type: doi
    value: 10.5281/zenodo.4813122
    description: "The version DOI for this version, which has a relation childOf with the concept DOI specified in the doi key in the root of this file."
  - type: other
    value: "ar:1234/5678.ABCD"
    description: "The identifier provided by Archival Repository, which points to this version of the software."

`definitions.license`

type: (Array of) definitions.license-enum objects.
required: N/A
description: The SPDX license identifier(s) for the license(s) under which a work is made available. When there are multiple licenses, it is assumed their relationship is OR, not AND.

usage:

license: Apache-2.0

license:
  - Apache-2.0
  - MIT

`definitions.license-enum`

type: enum with values:
- 0BSD
- AAL
- Abstyles
- Adobe-2006
- Adobe-Glyph
- ADSL
- AFL-1.1
- AFL-1.2
- AFL-2.0
- AFL-2.1
- AFL-3.0
- Afmparse
- AGPL-1.0
- AGPL-1.0-only
- AGPL-1.0-or-later
- AGPL-3.0
- AGPL-3.0-only
- AGPL-3.0-or-later
- Aladdin
- AMDPLPA
- AML
- AMPAS
- ANTLR-PD
- ANTLR-PD-fallback
- Apache-1.0
- Apache-1.1
- Apache-2.0
- APAFML
- APL-1.0
- APSL-1.0
- APSL-1.1
- APSL-1.2
- APSL-2.0
- Artistic-1.0
- Artistic-1.0-cl8
- Artistic-1.0-Perl
- Artistic-2.0
- Bahyph
- Barr
- Beerware
- BitTorrent-1.0
- BitTorrent-1.1
- blessing
- BlueOak-1.0.0
- Borceux
- BSD-1-Clause
- BSD-2-Clause
- BSD-2-Clause-FreeBSD
- BSD-2-Clause-NetBSD
- BSD-2-Clause-Patent
- BSD-2-Clause-Views
- BSD-3-Clause
- BSD-3-Clause-Attribution
- BSD-3-Clause-Clear
- BSD-3-Clause-LBNL
- BSD-3-Clause-Modification
- BSD-3-Clause-No-Nuclear-License
- BSD-3-Clause-No-Nuclear-License-2014
- BSD-3-Clause-No-Nuclear-Warranty
- BSD-3-Clause-Open-MPI
- BSD-4-Clause
- BSD-4-Clause-Shortened
- BSD-4-Clause-UC
- BSD-Protection
- BSD-Source-Code
- BSL-1.0
- BUSL-1.1
- bzip2-1.0.5
- bzip2-1.0.6
- C-UDA-1.0
- CAL-1.0
- CAL-1.0-Combined-Work-Exception
- Caldera
- CATOSL-1.1
- CC-BY-1.0
- CC-BY-2.0
- CC-BY-2.5
- CC-BY-3.0
- CC-BY-3.0-AT
- CC-BY-3.0-US
- CC-BY-4.0
- CC-BY-NC-1.0
- CC-BY-NC-2.0
- CC-BY-NC-2.5
- CC-BY-NC-3.0
- CC-BY-NC-4.0
- CC-BY-NC-ND-1.0
- CC-BY-NC-ND-2.0
- CC-BY-NC-ND-2.5
- CC-BY-NC-ND-3.0
- CC-BY-NC-ND-3.0-IGO
- CC-BY-NC-ND-4.0
- CC-BY-NC-SA-1.0
- CC-BY-NC-SA-2.0
- CC-BY-NC-SA-2.5
- CC-BY-NC-SA-3.0
- CC-BY-NC-SA-4.0
- CC-BY-ND-1.0
- CC-BY-ND-2.0
- CC-BY-ND-2.5
- CC-BY-ND-3.0
- CC-BY-ND-4.0
- CC-BY-SA-1.0
- CC-BY-SA-2.0
- CC-BY-SA-2.0-UK
- CC-BY-SA-2.1-JP
- CC-BY-SA-2.5
- CC-BY-SA-3.0
- CC-BY-SA-3.0-AT
- CC-BY-SA-4.0
- CC-PDDC
- CC0-1.0
- CDDL-1.0
- CDDL-1.1
- CDL-1.0
- CDLA-Permissive-1.0
- CDLA-Sharing-1.0
- CECILL-1.0
- CECILL-1.1
- CECILL-2.0
- CECILL-2.1
- CECILL-B
- CECILL-C
- CERN-OHL-1.1
- CERN-OHL-1.2
- CERN-OHL-P-2.0
- CERN-OHL-S-2.0
- CERN-OHL-W-2.0
- ClArtistic
- CNRI-Jython
- CNRI-Python
- CNRI-Python-GPL-Compatible
- Condor-1.1
- copyleft-next-0.3.0
- copyleft-next-0.3.1
- CPAL-1.0
- CPL-1.0
- CPOL-1.02
- Crossword
- CrystalStacker
- CUA-OPL-1.0
- Cube
- curl
- D-FSL-1.0
- diffmark
- DOC
- Dotseqn
- DRL-1.0
- DSDP
- dvipdfm
- ECL-1.0
- ECL-2.0
- eCos-2.0
- EFL-1.0
- EFL-2.0
- eGenix
- Entessa
- EPICS
- EPL-1.0
- EPL-2.0
- ErlPL-1.1
- etalab-2.0
- EUDatagrid
- EUPL-1.0
- EUPL-1.1
- EUPL-1.2
- Eurosym
- Fair
- Frameworx-1.0
- FreeBSD-DOC
- FreeImage
- FSFAP
- FSFUL
- FSFULLR
- FTL
- GD
- GFDL-1.1
- GFDL-1.1-invariants-only
- GFDL-1.1-invariants-or-later
- GFDL-1.1-no-invariants-only
- GFDL-1.1-no-invariants-or-later
- GFDL-1.1-only
- GFDL-1.1-or-later
- GFDL-1.2
- GFDL-1.2-invariants-only
- GFDL-1.2-invariants-or-later
- GFDL-1.2-no-invariants-only
- GFDL-1.2-no-invariants-or-later
- GFDL-1.2-only
- GFDL-1.2-or-later
- GFDL-1.3
- GFDL-1.3-invariants-only
- GFDL-1.3-invariants-or-later
- GFDL-1.3-no-invariants-only
- GFDL-1.3-no-invariants-or-later
- GFDL-1.3-only
- GFDL-1.3-or-later
- Giftware
- GL2PS
- Glide
- Glulxe
- GLWTPL
- gnuplot
- GPL-1.0
- GPL-1.0-only
- GPL-1.0-or-later
- GPL-1.0+
- GPL-2.0
- GPL-2.0-only
- GPL-2.0-or-later
- GPL-2.0-with-autoconf-exception
- GPL-2.0-with-bison-exception
- GPL-2.0-with-classpath-exception
- GPL-2.0-with-font-exception
- GPL-2.0-with-GCC-exception
- GPL-2.0+
- GPL-3.0
- GPL-3.0-only
- GPL-3.0-or-later
- GPL-3.0-with-autoconf-exception
- GPL-3.0-with-GCC-exception
- GPL-3.0+
- gSOAP-1.3b
- HaskellReport
- Hippocratic-2.1
- HPND
- HPND-sell-variant
- HTMLTIDY
- IBM-pibs
- ICU
- IJG
- ImageMagick
- iMatix
- Imlib2
- Info-ZIP
- Intel
- Intel-ACPI
- Interbase-1.0
- IPA
- IPL-1.0
- ISC
- JasPer-2.0
- JPNIC
- JSON
- LAL-1.2
- LAL-1.3
- Latex2e
- Leptonica
- LGPL-2.0
- LGPL-2.0-only
- LGPL-2.0-or-later
- LGPL-2.0+
- LGPL-2.1
- LGPL-2.1-only
- LGPL-2.1-or-later
- LGPL-2.1+
- LGPL-3.0
- LGPL-3.0-only
- LGPL-3.0-or-later
- LGPL-3.0+
- LGPLLR
- Libpng
- libpng-2.0
- libselinux-1.0
- libtiff
- LiLiQ-P-1.1
- LiLiQ-R-1.1
- LiLiQ-Rplus-1.1
- Linux-OpenIB
- LPL-1.0
- LPL-1.02
- LPPL-1.0
- LPPL-1.1
- LPPL-1.2
- LPPL-1.3a
- LPPL-1.3c
- MakeIndex
- MirOS
- MIT
- MIT-0
- MIT-advertising
- MIT-CMU
- MIT-enna
- MIT-feh
- MIT-Modern-Variant
- MIT-open-group
- MITNFA
- Motosoto
- mpich2
- MPL-1.0
- MPL-1.1
- MPL-2.0
- MPL-2.0-no-copyleft-exception
- MS-PL
- MS-RL
- MTLL
- MulanPSL-1.0
- MulanPSL-2.0
- Multics
- Mup
- NAIST-2003
- NASA-1.3
- Naumen
- NBPL-1.0
- NCGL-UK-2.0
- NCSA
- Net-SNMP
- NetCDF
- Newsletr
- NGPL
- NIST-PD
- NIST-PD-fallback
- NLOD-1.0
- NLPL
- Nokia
- NOSL
- Noweb
- NPL-1.0
- NPL-1.1
- NPOSL-3.0
- NRL
- NTP
- NTP-0
- Nunit
- O-UDA-1.0
- OCCT-PL
- OCLC-2.0
- ODbL-1.0
- ODC-By-1.0
- OFL-1.0
- OFL-1.0-no-RFN
- OFL-1.0-RFN
- OFL-1.1
- OFL-1.1-no-RFN
- OFL-1.1-RFN
- OGC-1.0
- OGDL-Taiwan-1.0
- OGL-Canada-2.0
- OGL-UK-1.0
- OGL-UK-2.0
- OGL-UK-3.0
- OGTSL
- OLDAP-1.1
- OLDAP-1.2
- OLDAP-1.3
- OLDAP-1.4
- OLDAP-2.0
- OLDAP-2.0.1
- OLDAP-2.1
- OLDAP-2.2
- OLDAP-2.2.1
- OLDAP-2.2.2
- OLDAP-2.3
- OLDAP-2.4
- OLDAP-2.5
- OLDAP-2.6
- OLDAP-2.7
- OLDAP-2.8
- OML
- OpenSSL
- OPL-1.0
- OSET-PL-2.1
- OSL-1.0
- OSL-1.1
- OSL-2.0
- OSL-2.1
- OSL-3.0
- Parity-6.0.0
- Parity-7.0.0
- PDDL-1.0
- PHP-3.0
- PHP-3.01
- Plexus
- PolyForm-Noncommercial-1.0.0
- PolyForm-Small-Business-1.0.0
- PostgreSQL
- PSF-2.0
- psfrag
- psutils
- Python-2.0
- Qhull
- QPL-1.0
- Rdisc
- RHeCos-1.1
- RPL-1.1
- RPL-1.5
- RPSL-1.0
- RSA-MD
- RSCPL
- Ruby
- SAX-PD
- Saxpath
- SCEA
- Sendmail
- Sendmail-8.23
- SGI-B-1.0
- SGI-B-1.1
- SGI-B-2.0
- SHL-0.5
- SHL-0.51
- SimPL-2.0
- SISSL
- SISSL-1.2
- Sleepycat
- SMLNJ
- SMPPL
- SNIA
- Spencer-86
- Spencer-94
- Spencer-99
- SPL-1.0
- SSH-OpenSSH
- SSH-short
- SSPL-1.0
- StandardML-NJ
- SugarCRM-1.1.3
- SWL
- TAPR-OHL-1.0
- TCL
- TCP-wrappers
- TMate
- TORQUE-1.1
- TOSL
- TU-Berlin-1.0
- TU-Berlin-2.0
- UCL-1.0
- Unicode-DFS-2015
- Unicode-DFS-2016
- Unicode-TOU
- Unlicense
- UPL-1.0
- Vim
- VOSTROM
- VSL-1.0
- W3C
- W3C-19980720
- W3C-20150513
- Watcom-1.0
- Wsuipa
- WTFPL
- wxWindows
- X11
- Xerox
- XFree86-1.1
- xinetd
- Xnet
- xpp
- XSkat
- YPL-1.0
- YPL-1.1
- Zed
- Zend-2.0
- Zimbra-1.3
- Zimbra-1.4
- Zlib
- zlib-acknowledgement
- ZPL-1.1
- ZPL-2.0
- ZPL-2.1
required: N/A
description: SPDX identifier for the license under which a work is made available. The list of identifiers originates from https://github.com/spdx/license-list-data/blob/bd8e963a41b13524b2ccb67f9335d2dd397c378e/json/licenses.json.

usage:

license: Apache-2.0

license:
  - Apache-2.0
  - MIT

`definitions.orcid`

type: uri with pattern https://orcid\.org/[0-9]{4}-[0-9]{4}-[0-9]{4}-[0-9]{3}[0-9X]{1}
required: N/A
description: An ORCID identifier.

usage:

authors:
  - family-names: Druskat
    given-names: Stephan
    orcid: "https://orcid.org/0000-0003-4925-7248"

`definitions.person`

type: object with the following keys:
- address
- affiliation
- alias
- city
- country
- email
- family-names
- fax
- given-names
- name-particle
- name-suffix
- orcid
- post-code
- region
- tel
- website
required: N/A
description: A person. The Citation File Format aims to implement a culturally neutral model for personal names, according to the suggestions on splitting personal names by the W3C and the implementation of personal name splitting in BibTeX (Hufflen, 2006). To this end, the Citation File Format provides four generic keys to specify personal names:
1. Values for family-names specify family names, including combinations of given and patronymic forms, such as Guðmundsdóttir or bin Osman; double names with or without hyphen, such as Leutheusser-Schnarrenberger or Sánchez Vicario. It can potentially also specify names that include prepositions or (nobiliary) particles, especially if they occur in between family names such as in Spanish- or Portuguese-origin names, such as Fernández de Córdoba.
2. Values for given-names specify given and any other names.
3. Values for name-particle specify nobiliary particles and prepositions, such as in Ludwig van Beethoven or Rafael van der Vaart.
4. Values for name-suffix specify suffixes such as Jr. or III (as in Frank Edwin Wright III).

Note that these keys may still not be optimal for, e.g., Icelandic names which do not have the concept of family names, or Chinese generation names, but represent a best effort.

usage:

authors:
  - address: "742 Evergreen Terrace"
    affiliation: "German Aerospace Center (DLR)"
    alias: sdruskat
    city: Berlin
    country: DE
    email: sdruskat@research-project.org
    family-names: Druskat
    fax: +12-3456-7890
    given-names: Stephan
    name-particle: von
    name-suffix: III
    orcid: "https://orcid.org/0000-0003-4925-7248"
    post-code: 90210
    region: Renfrewshire
    tel: +12-345-6789098
    website: "https://research-project.org"

`definitions.person.address`

type: definitions.address
required: false
description: The person's address.

usage:

authors:
  - family-names: Druskat
    given-names: Stephan
    address: "742 Evergreen Terrace"

`definitions.person.affiliation`

type: Nonempty string
required: false
description: The person's affiliation.

usage:

authors:
  - family-names: Druskat
    given-names: Stephan
    affiliation: "German Aerospace Center (DLR)"

`definitions.person.alias`

type: definitions.alias
required: false
description: The person's alias.

usage:

authors:
  - family-names: Druskat
    given-names: Stephan
    alias: sdruskat

`definitions.person.city`

type: definitions.city
required: false
description: The person's city.

usage:

authors:
  - family-names: Druskat
    given-names: Stephan
    city: Berlin

`definitions.person.country`

type: definitions.country
required: false
description: The person's country.

usage:

authors:
  - family-names: Druskat
    given-names: Stephan
    country: DE

`definitions.person.email`

type: definitions.email
required: false
description: The person's email address.

usage:

authors:
  - family-names: Druskat
    given-names: Stephan
    email: mail@research-project.org

`definitions.person.family-names`

type: Nonempty string
required: false
description: The person's family names.

usage:

authors:
  - family-names: Druskat
    given-names: Stephan

`definitions.person.fax`

type: definitions.fax
required: false
description: The person's fax number.

usage:

authors:
  - family-names: Druskat
    given-names: Stephan
    fax: +12-3456-7890

`definitions.person.given-names`

type: Nonempty string
required: false
description: The person's given names.

usage:

authors:
  - family-names: Druskat
    given-names: Stephan

`definitions.person.name-particle`

type: Nonempty string
required: false
description: The person's name particle, e.g., a nobiliary particle or a [preposition] meaning 'of' or 'from' (for example 'von' in 'Alexander von Humboldt').

usage:

authors:
  - family-names: Humboldt
    given-names: Alexander
    name-particle: von

`definitions.person.name-suffix`

type: Nonempty string
required: false
description: The person's name suffix, e.g. 'Jr.' for Sammy Davis Jr. or 'III' for Frank Edwin Wright III.

usage:

authors:
  - family-names: Davis
    given-names: Sammy
    name-suffix: Jr.

`definitions.person.orcid`

type: definitions.orcid
required: false
description: The person's ORCID identifier.

usage:

authors:
  - family-names: Druskat
    given-names: Stephan
    orcid: "https://orcid.org/0000-0003-4925-7248"

`definitions.person.post-code`

type: definitions.post-code
required: false
description: The person's post code.

usage:

authors:
  - family-names: Druskat
    given-names: Stephan
    post-code: 90210

authors:
  - family-names: Druskat
    given-names: Stephan
    post-code: "90210"

`definitions.person.region`

type: definitions.region
required: false
description: The person's region.

usage:

authors:
  - family-names: Druskat
    given-names: Stephan
    region: Renfrewshire

`definitions.person.tel`

type: definitions.tel
required: false
description: The person's telephone number.

usage:

authors:
  - family-names: Druskat
    given-names: Stephan
    tel: +12-345-6789098

`definitions.person.website`

type: definitions.url
required: false
description: The person's website.

usage:

authors:
  - family-names: Druskat
    given-names: Stephan
    website: "https://research-project.org"

`definitions.post-code`

type: string or number
required: N/A
description: A post code.

usage:

authors:
  - name: "The Research Software Project"
    post-code: "G42 2PN"

authors:
  - name: "The Research Software Project"
    post-code: 12053

`definitions.reference`

type: object with the following keys:
- abbreviation
- abstract
- authors
- collection-doi
- collection-title
- collection-type
- commit
- conference
- contact
- copyright
- data-type
- database-provider
- database
- date-accessed
- date-downloaded
- date-published
- date-released
- department
- doi
- edition
- editors
- editors-series
- end
- entry
- filename
- format
- identifiers
- institution
- isbn
- issn
- issue
- issue-date
- issue-title
- journal
- keywords
- languages
- license
- license-url
- loc-end
- loc-start
- location
- medium
- month
- nihmsid
- notes
- number
- number-volumes
- pages
- patent-states
- pmcid
- publisher
- recipients
- repository
- repository-artifact
- repository-code
- scope
- section
- senders
- start
- status
- term
- thesis-type
- title
- translators
- type
- url
- version
- volume
- volume-title
- year
- year-original
required: N/A
description: A reference.

usage:

references:
  - authors:
      - family-names: Smith
        given-names: "A. M."
      - family-names: Katz
        given-names: "D. S."
      - family-names: Niemeyer
        given-names: "K. E."
      - name: "FORCE11 Software Citation Working Group"
    doi: 10.7717/peerj-cs.86
    journal: "PeerJ Computer Science"
    month: 9
    start: e86
    title: "Software citation principles"
    type: article
    volume: 2
    year: 2016

references:
  - abbreviation: NP
    abstract: "This is a non-sensical example reference to show how the many different keys in a reference object can be used."
    authors:
      - name: "The Research Software Project"
    collection-doi: 10.5281/zenodo.1003149
    collection-title: "Proceedings of the Research Conference 2021"
    collection-type: proceedings
    commit: 16192bf05e99bcb35d5c3e085047807b5720fafc
    conference:
      name: "Research Conference 2021"
    contact:
      - name: "The RC21 Organizing Committee"
    copyright: "© 2021 The Research Software Project team"
    data-type: YAML
    database: "Research Database"
    database-provider:
      name: "Research Databases Ltd."
    date-accessed: "2021-07-27"
    date-downloaded: "2021-07-27"
    date-published: "2021-07-26"
    date-released: "2021-07-26"
    department: "Department of Hard Science Fiction"
    doi: 10.5281/zenodo.4813122
    edition: "2nd abridged edition"
    editors:
      - family-names: Inchief
        given-names: Editor
      - name: "The RCProc Editorial Team"
    editors-series:
      - family-names: Editor
        given-names: Series
      - name: "The Series Editors"
    end: 42
    entry: "Citation <n. 1>"
    filename: CITATION.cff
    format: "Citation File Format"
    identifiers:
      - description: "The concept DOI of the work."
        type: doi
        value: 10.5281/zenodo.1003149
      - description: "The versioned DOI for version 1.1.0 of the work."
        type: doi
        value: 10.5281/zenodo.4813122
      - description: "The Software Heritage identifier for version 1.1.0 of the work."
        type: swh
        value: "swh:1:dir:bc286860f423ea7ced246ba7458eef4b4541cf2d"
      - description: "The GitHub release URL of tag 1.1.0."
        type: url
        value: "https://github.com/citation-file-format/citation-file-format/releases/tag/1.1.0"
    institution:
      name: "University of Arcadia"
    isbn: "9781603095075"
    issn: 2475-9066
    issue: 42
    issue-date: "November/December 2021"
    issue-title: "Special Issue: Software Citation"
    journal: "Journal of Open Source Software"
    keywords:
      - "software citation"
      - "citation file format"
      - research
    languages:
      - en
      - haw
    license: Apache-2.0
    license-url: "https://obscure-licenses.com?id=1234"
    loc-end: 42
    loc-start: 21
    location:
      name: "Library of the Unseen University"
    medium: "5¼-inch floppy disk"
    month: 7
    nihmsid: NIHMS236863
    notes: "Excellent reference! TODO Read for thesis."
    number: 12053
    number-volumes: 7
    pages: 78
    patent-states:
      - Canada
    pmcid: PMC3134971
    publisher:
      name: "Open Access Publishing House"
    recipients:
      - name: "Recipient entity of personal communication"
      - family-names: Recipient
        given-names: Communication
    repository: "https://ascl.net/2105.013"
    repository-artifact: "https://search.maven.org/artifact/org.corpus-tools/cff-maven-plugin/0.4.0/maven-plugin"
    repository-code: "https://github.com/citation-file-format/my-research-software"
    scope: "Supplement 2: Additional material"
    section: 7
    senders:
      - name: "Sender entity of personal communication"
      - family-names: Sender
        given-names: Communication
    start: 17
    status: submitted
    term: Citation
    thesis-type: "PhD thesis"
    title: "Towards better software citation"
    translators:
      - name: "Research Translators Ltd."
      - family-names: Lator
        given-names: Trans
    type: conference-paper
    url: "https://citation-file-format.github.io/"
    version: 0.3.12
    volume: 2
    volume-title: "Volume II: How it went on"
    year: 2021
    year-original: 1978

`definitions.reference.abbreviation`

type: Nonempty string
required: false
description: The abbreviation of a work.

usage:

preferred-citation:
  abbreviation: ABC
  type: generic

references:
  - abbreviation: DEF
    type: generic

`definitions.reference.abstract`

type: Nonempty string
required: false
description: The abstract of the work.
- If the work is a journal paper or other academic work: The abstract of the work.
- If the work is a film, broadcast or similar: The synopsis of the work.

usage:

preferred-citation:
  abstract: "This work describes the software or dataset that should be actually cited. etc."
  type: generic

references:
  - abstract: "This work implements an algorithm that we use in our software. etc."
    type: generic

`definitions.reference.authors`

type: Array of definitions.person and/or definitions.entity objects.
required: true
description: The authors of the work.

usage:

preferred-citation:
  authors:
    - name: "The Research Software Project team"
    - family-names: Druskat
      given-names: Stephan
  type: generic

references:
  - authors:
      - name: "The Research Software Project team"
      - family-names: Druskat
        given-names: Stephan
    type: generic

How to deal with unknown individual authors?

To enable credit for the individuals that have created a work, it is good practice to cite the respective individuals as authors. Sometimes you may not be able to determine the person names of the relevant individuals to create definitions.person objects for them, for example when a software you cite does not provide a CITATION.cff file. Then, the next best thing is to refer to those that you could not determine person names for collectively as a "team" or "project" using the title of the work in a definitions.entity object:

authors:
  - name: "The Research Software project"

authors:
  - family-names: Spaaks
    given-names: "Jurriaan H."
  - family-names: Druskat
    given-names: Stephan
  - name: "The Research Software team"

This still represents the maximum knowledge you have about the authors. It's also a good starting point to enable users of the citation metadata to determine the correct names themselves in the future, especially if you also provide a source of information such as a repository-code or a url.

If the authors of a work are truly anonymous, you can represent this in the same way:

authors:
  - name: anonymous

`definitions.reference.collection-doi`

type: definitions.doi
required: false
description: The DOI of a collection containing the work.

usage:

preferred-citation:
  collection-doi: 10.5281/zenodo.1003149
  type: generic

references:
  - collection-doi: 10.5281/zenodo.1003149
    type: generic

`definitions.reference.collection-title`

type: Nonempty string
required: false
description: The title of a collection or proceedings.

usage:

preferred-citation:
  collection-title: "Proceedings of the Research Conference 2021"
  type: generic

references:
  - collection-title: "Proceedings of the Research Conference 2021"
    type: generic

`definitions.reference.collection-type`

type: Nonempty string
required: false
description: The type of a collection.

usage:

preferred-citation:
  collection-type: proceedings
  type: generic

references:
  - collection-type: proceedings
    type: generic

`definitions.reference.commit`

type: definitions.commit
required: false
description: The (e.g., Git) commit hash or (e.g., Subversion) revision number of the work.

usage:

preferred-citation:
  commit: "16192bf05e99bcb35d5c3e085047807b5720fafc"
  type: generic

references:
  - commit: "16192bf05e99bcb35d5c3e085047807b5720fafc"
    type: generic

`definitions.reference.conference`

type: definitions.entity
required: false
description: The conference where the work was presented.

usage:

preferred-citation:
  conference:
    name: "Research Conference 2021"
  type: generic

references:
  - conference:
      name: "Research Conference 2021"
    type: generic

`definitions.reference.contact`

type: Array of definitions.person and/or definitions.entity objects.
required: false
description: The contact person, group, company, etc. for a work.

usage:

references:
  - contact:
    - name: "The RC21 Organizing Committee"
    - family-names: Druskat
      given-names: Stephan
    type: generic

preferred-citation:
  contact:
    - name: "The RC21 Organizing Committee"
    - family-names: Druskat
      given-names: Stephan
  type: generic

`definitions.reference.copyright`

type: Nonempty string
required: false
description: The copyright information pertaining to the work.

usage:

preferred-citation:
  copyright: "© 2021 The Research Software Project team"
  type: generic

references:
  - copyright: "© 2021 The Research Software Project team"
    type: generic

`definitions.reference.data-type`

type: Nonempty string
required: false
description: The data type of a data set.

usage:

preferred-citation:
  data-type: YAML
  type: generic

references:
  - data-type: YAML
    type: generic

`definitions.reference.database-provider`

type: definitions.entity
required: false
description: The provider of the database where a work was accessed/is stored.

usage:

preferred-citation:
  database-provider:
    name: "Research Databases Ltd."
  type: generic

references:
  - database-provider:
      name: "Research Databases Ltd."
    type: generic

`definitions.reference.database`

type: Nonempty string
required: false
description: The name of the database where a work was accessed/is stored.

usage:

preferred-citation:
  database: "Research Database"
  type: generic

references:
  - database: "Research Database"
    type: generic

`definitions.reference.date-accessed`

type: definitions.date
required: false
description: The date the work was accessed.

usage:

preferred-citation:
  date-accessed: "2021-07-27"
  type: generic

references:
  - date-accessed: "2021-07-27"
    type: generic

`definitions.reference.date-downloaded`

type: definitions.date
required: false
description: The date the work has been downloaded.

usage:

preferred-citation:
  date-downloaded: "2021-07-27"
  type: generic

references:
  - date-downloaded: "2021-07-27"
    type: generic

`definitions.reference.date-published`

type: definitions.date
required: false
description: The date the work has been published.

usage:

references:
  - date-published: "2021-07-27"
    type: generic

preferred-citation:
  date-published: "2021-07-27"
  type: generic

`definitions.reference.date-released`

type: definitions.date
required: false
description: The date the work has been released.

usage:

preferred-citation:
  date-released: "2021-07-27"
  type: generic

references:
  - date-released: "2021-07-27"
    type: generic

`definitions.reference.department`

type: Nonempty string
required: false
description: The department where a work has been produced.

usage:

preferred-citation:
  department: "Department of Hard Science Fiction"
  type: generic

references:
  - department: "Department of Hard Science Fiction"
    type: generic

`definitions.reference.doi`

type: definitions.doi
required: false
description: The DOI of the work.

usage:

preferred-citation:
  doi: 10.5281/zenodo.4813122
  type: generic

references:
  - doi: 10.5281/zenodo.4813122
    type: generic

`definitions.reference.edition`

type: Nonempty string
required: false
description: The edition of the work.

usage:

preferred-citation:
  edition: "2nd abridged edition"
  type: generic

references:
  - edition: "2nd abridged edition"
    type: generic

`definitions.reference.editors`

type: Array of definitions.person and/or definitions.entity objects.
required: false
description: The editor(s) of a work.

usage:

preferred-citation:
  editors:
    - family-names: Inchief
      given-names: Editor
    - name: "The RCProc Editorial Team"
  type: generic

references:
  - editors:
    - family-names: Inchief
      given-names: Editor
    - name: "The RCProc Editorial Team"
    type: generic

`definitions.reference.editors-series`

type: Array of definitions.person and/or definitions.entity objects.
required: false
description: The editor(s) of a series in which a work has been published.

usage:

preferred-citation:
  editors-series:
    - family-names: Editor
      given-names: Series
    - name: "The Series Editors"
  type: generic

references:
  - editors-series:
    - family-names: Editor
      given-names: Series
    - name: "The Series Editors"
    type: generic

`definitions.reference.end`

type: Nonempty string or integer
required: false
description: The end page of the work.

usage:

preferred-citation:
  end: "42"
  type: generic

preferred-citation:
  end: 42
  type: generic

references:
  - end: "42"
    type: generic

references:
  - end: 42
    type: generic

`definitions.reference.entry`

type: Nonempty string
required: false
description: An entry in the collection that constitutes the work.

usage:

preferred-citation:
  entry: "Citation <n. 1>"
  type: generic

references:
  - entry: "Citation <n. 1>"
    type: generic

`definitions.reference.filename`

type: Nonempty string
required: false
description: The name of the electronic file containing the work.

usage:

preferred-citation:
  filename: CITATION.cff
  type: generic

references:
  - filename: CITATION.cff
    type: generic

`definitions.reference.format`

type: Nonempty string
required: false
description: The format in which a work is represented.

usage:

preferred-citation:
  format: "Citation File Format"
  type: generic

references:
  - format: "Citation File Format"
    type: generic

`definitions.reference.identifiers`

type: Array of definitions.identifier objects.
required: false
description: The identifier(s) of the work.

usage:

preferred-citation:
  identifiers:
    - description: "The concept DOI of the work."
      type: doi
      value: 10.5281/zenodo.1003149
    - description: "The versioned DOI for version 1.1.0 of the work."
      type: doi
      value: 10.5281/zenodo.4813122
    - description: "The Software Heritage identifier for version 1.1.0 of the work."
      type: swh
      value: "swh:1:dir:bc286860f423ea7ced246ba7458eef4b4541cf2d"
    - description: "The GitHub release URL of tag 1.1.0."
      type: url
      value: "https://github.com/citation-file-format/citation-file-format/releases/tag/1.1.0"
  type: generic

references:
  - identifiers:
      - description: "The concept DOI of the work."
        type: doi
        value: 10.5281/zenodo.1003149
      - description: "The versioned DOI for version 1.1.0 of the work."
        type: doi
        value: 10.5281/zenodo.4813122
      - description: "The Software Heritage identifier for version 1.1.0 of the work."
        type: swh
        value: "swh:1:dir:bc286860f423ea7ced246ba7458eef4b4541cf2d"
      - description: "The GitHub release URL of tag 1.1.0."
        type: url
        value: "https://github.com/citation-file-format/citation-file-format/releases/tag/1.1.0"
    type: generic

`definitions.reference.institution`

type: definitions.entity
required: false
description: The institution where a work has been produced or published.

usage:

preferred-citation:
  institution:
    name: "University of Arcadia"
  type: generic

references:
  - institution:
      name: "University of Arcadia"
    type: generic

`definitions.reference.isbn`

type: string with pattern ^[0-9\- ]{10,17}X?$
required: false
description: The ISBN of the work.

usage:

preferred-citation:
  isbn: "9781603095075"
  type: generic

references:
  - isbn: "9781603095075"
    type: generic

`definitions.reference.issn`

type: string with pattern ^\d{4}-\d{3}[\dxX]$
required: false
description: The ISSN of the work.

usage:

preferred-citation:
  issn: "2475-9066"
  type: generic

references:
  - issn: "2475-9066"
    type: generic

`definitions.reference.issue`

type: Nonempty string or number
required: false
description: The issue of a periodical in which a work appeared.

usage:

preferred-citation:
  issue: "42"
  type: generic

references:
  - issue: "42"
    type: generic

preferred-citation:
  issue: 42
  type: generic

references:
  - issue: 42
    type: generic

`definitions.reference.issue-date`

type: Nonempty string
required: false
description: The publication date of the issue of a periodical in which a work appeared.

usage:

preferred-citation:
  issue-date: "November/December 2021"
  type: generic

references:
  - issue-date: "November/December 2021"
    type: generic

preferred-citation:
  issue-date: "2021-12-31"
  type: generic

references:
  - issue-date: "2021-12-31"
    type: generic

`definitions.reference.issue-title`

type: Nonempty string
required: false
description: The name of the issue of a periodical in which the work appeared.

usage:

preferred-citation:
  issue-title: "Special Issue: Software Citation"
  type: generic

references:
  - issue-title: "Special Issue: Software Citation"
    type: generic

`definitions.reference.journal`

type: Nonempty string
required: false
description: The name of the journal/magazine/newspaper/periodical where the work was published.

usage:

preferred-citation:
  journal: "Journal of Open Source Software"
  type: generic

references:
  - journal: "Journal of Open Source Software"
    type: generic

`definitions.reference.keywords`

type: Array of nonempty string
required: false
description: Keywords pertaining to the work.

usage:

preferred-citation:
  keywords:
    - "software citation"
    - "citation file format"
    - research
  type: generic

references:
  - keywords:
      - "software citation"
      - "citation file format"
      - research
    type: generic

`definitions.reference.languages`

type: Array of ISO 639 string with 2 or 3 characters and pattern ^[a-z]{2,3}$
required: false
description: The language identifier(s) of the work according to ISO 639 language strings.

usage:

preferred-citation:
  languages:
    - en
    - haw
  type: generic

references:
  - languages:
      - en
      - haw
    type: generic

`definitions.reference.license`

type: (Array of) definitions.license-enum.
required: false
description: The SPDX license identifier(s) for the license(s) under which the work is made available. When there are multiple licenses, it is assumed their relationship is OR, not AND.

usage:

preferred-citation:
  license: Apache-2.0
  type: generic

references:
  - license: Apache-2.0
    type: generic

preferred-citation:
  license:
    - Apache-2.0
    - MIT
  type: generic

references:
  - license:
      - Apache-2.0
      - MIT
    type: generic

`definitions.reference.license-url`

type: definitions.url
required: false
description: The URL of the license text under which the work is licensed (only for non-standard licenses not included in the SPDX License List).

usage:

preferred-citation:
  license-url: "https://obscure-licenses.com?id=1234"
  type: generic

references:
  - license-url: "https://obscure-licenses.com?id=1234"
    type: generic

`definitions.reference.loc-end`

type: Nonempty string or integer
required: false
description: The line of code in the file where the work ends.

usage:

preferred-citation:
  loc-end: "42"
  type: generic

preferred-citation:
  loc-end: 42
  type: generic

references:
  - loc-end: "42"
    type: generic

references:
  - loc-end: 42
    type: generic

`definitions.reference.loc-start`

type: Nonempty string or integer
required: false
description: The line of code in the file where the work starts.

usage:

preferred-citation:
  loc-start: "21"
  type: generic

preferred-citation:
  loc-start: 21
  type: generic

references:
  - loc-start: "21"
    type: generic

references:
  - loc-start: 21
    type: generic

`definitions.reference.location`

type: definitions.entity
required: false
description: The location of the work.

usage:

preferred-citation:
  location:
    name: "Library of the Unseen University"
  type: generic

references:
  - location:
      name: "Library of the Unseen University"
    type: generic

`definitions.reference.medium`

type: Nonempty string
required: false
description: The medium of the work.

usage:

preferred-citation:
  medium: "5¼-inch floppy disk"
  type: generic

references:
  - medium: "5¼-inch floppy disk"
    type: generic

`definitions.reference.month`

type: integer in range 1-12 or enum with values:
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
required: false
description: The month in which a work has been published.

usage:

preferred-citation:
  month: 7
  type: generic

preferred-citation:
  month: "7"
  type: generic

references:
  - month: 7
    type: generic

references:
  - month: "7"
    type: generic

`definitions.reference.nihmsid`

type: Nonempty string
required: false
description: The NIHMSID of a work.

usage:

preferred-citation:
  nihmsid: NIHMS236863
  type: generic

references:
  - nihmsid: NIHMS236863
    type: generic

`definitions.reference.notes`

type: Nonempty string
required: false
description: Notes pertaining to the work. Note that this key should contain notes that may be picked up by some downstream tooling (e.g., reference managers), but not others (e.g., a software index).

usage:

preferred-citation:
  notes: "Excellent reference! TODO Read for thesis."
  type: generic

references:
  - notes: "Excellent reference! TODO Read for thesis."
    type: generic

`definitions.reference.number`

type: string or number
required: false
description: The (library) accession number for a work.

usage:

preferred-citation:
  number: "005.1-ABC"
  type: generic

references:
  - number: "005.1-ABC"
    type: generic

preferred-citation:
  number: 1234567
  type: generic

references:
  - number: 1234567
    type: generic

preferred-citation:
  number: 1.4
  type: generic

references:
  - number: 1.4
    type: generic

`definitions.reference.number-volumes`

type: Nonempty string or integer
required: false
description: The number of volumes making up the collection in which the work has been published.

usage:

preferred-citation:
  number-volumes: "4"
  type: generic

preferred-citation:
  number-volumes: 4
  type: generic

references:
  - number-volumes: "4"
    type: generic

references:
  - number-volumes: 4
    type: generic

`definitions.reference.pages`

type: Nonempty string or integer
required: false
description: The number of pages of the work.

usage:

preferred-citation:
  pages: "123"
  type: generic

preferred-citation:
  pages: 123
  type: generic

references:
  - pages: "123"
    type: generic

references:
  - pages: 123
    type: generic

`definitions.reference.patent-states`

type: Array of nonemtpy string
required: false
description: The states for which a patent is granted.

usage:

preferred-citation:
  patent-states:
    - Canada
    - IL
  type: generic

references:
  - patent-states:
      - Canada
      - IL
    type: generic

`definitions.reference.pmcid`

type: string with pattern ^PMC[0-9]{7}$
required: false
description: The PMCID of a work.

usage:

preferred-citation:
  pmcid: PMC3134971
  type: generic

references:
  - pmcid: PMC3134971
    type: generic

`definitions.reference.publisher`

type: definitions.entity
required: false
description: The publisher who has published the work.

usage:

preferred-citation:
  publisher:
    name: "Open Access Publishing House"
  type: generic

references:
  - publisher:
      name: "Open Access Publishing House"
    type: generic

`definitions.reference.recipients`

type: Array of definitions.person and/or definitions.entity objects.
required: false
description: The recipient(s) of a personal communication.

usage:

preferred-citation:
  recipients:
    - name: "Recipient entity of personal communication"
    - family-names: Recipient
      given-names: Communication
  type: generic

references:
  - recipients:
      - name: "Recipient entity of personal communication"
      - family-names: Recipient
        given-names: Communication
    type: generic

`definitions.reference.repository`

type: definitions.url
required: false
description: The URL of the work in a repository/archive (when the repository is neither a source code repository nor a build artifact repository).

usage:

preferred-citation:
  repository: "https://ascl.net/2105.013"
  type: generic

references:
  - repository: "https://ascl.net/2105.013"
    type: generic

`definitions.reference.repository-artifact`

type: definitions.url
required: false
description: The URL of the work in a build artifact/binary repository.

usage:

preferred-citation:
  repository-artifact: "https://search.maven.org/artifact/org.corpus-tools/cff-maven-plugin/0.4.0/maven-plugin"
  type: generic

references:
  - repository-artifact: "https://search.maven.org/artifact/org.corpus-tools/cff-maven-plugin/0.4.0/maven-plugin"
    type: generic

`definitions.reference.repository-code`

type: definitions.url
required: false
description: The URL of the work in a source code repository.

usage:

preferred-citation:
  repository-code: "https://github.com/citation-file-format/my-research-software"
  type: generic

references:
  - repository-code: "https://github.com/citation-file-format/my-research-software"
    type: generic

`definitions.reference.scope`

type: Nonempty string
required: false
description: The scope of the reference, e.g., the section of the work it adheres to.

usage:

preferred-citation:
  scope: "Supplement 2: Additional material"
  type: generic

references:
  - scope: "Supplement 2: Additional material"
    type: generic

`definitions.reference.section`

type: string or number
required: false
description: The section of a work that is referenced.

usage:

preferred-citation:
  section: "Section 7: Software citation"
  type: generic

references:
  - section: "Section 7: Software citation"
    type: generic

preferred-citation:
  section: 7
  type: generic

references:
  - section: 7
    type: generic

preferred-citation:
  section: 7.1
  type: generic

references:
  - section: 7.1
    type: generic

`definitions.reference.senders`

type: Array of definitions.person and/or definitions.entity objects.
required: false
description: The sender(s) of a personal communication.

usage:

preferred-citation:
  senders:
    - name: "Sender entity of personal communication"
    - family-names: Sender
      given-names: Communication
  type: generic

references:
  - senders:
      - name: "Sender entity of personal communication"
      - family-names: Sender
        given-names: Communication
    type: generic

`definitions.reference.start`

type: Nonempty string or integer
required: false
description: The start page of the work.

usage:

preferred-citation:
  start: "42"
  type: generic

preferred-citation:
  start: 42
  type: generic

references:
  - start: "42"
    type: generic

references:
  - start: 42
    type: generic

`definitions.reference.status`

type: enum with values:
- abstract
- advance-online
- in-preparation
- in-press
- preprint
- submitted
required: false
description: The publication status of the work.

usage:

preferred-citation:
  status: submitted
  type: generic

references:
  - status: submitted
    type: generic

`definitions.reference.term`

type: Nonempty string
required: false
description: The term being referenced if the work is a dictionary or encyclopedia.

usage:

preferred-citation:
  term: Citation
  type: generic

references:
  - term: Citation
    type: generic

`definitions.reference.thesis-type`

type: Nonempty string
required: false
description: The type of the thesis that is the work.

usage:

preferred-citation:
  thesis-type: "PhD thesis"
  type: generic

references:
  - thesis-type: "PhD thesis"
    type: generic

`definitions.reference.title`

type: Nonempty string
required: true
description: The title of the work.

usage:

preferred-citation:
  title: "Towards better software citation"
  type: generic

references:
  - title: "Towards better software citation"
    type: generic

`definitions.reference.translators`

type: Array of definitions.person and/or definitions.entity objects.
required: false
description: The translator(s) of a work.

usage:

preferred-citation:
  translators:
    - name: "Research Translators Ltd."
    - family-names: Lator
      given-names: Trans
  type: generic

references:
  - translators:
      - name: "Research Translators Ltd."
      - family-names: Lator
        given-names: Trans
    type: generic

`definitions.reference.type`

type: enum with values:
- art
- article
- audiovisual
- bill
- blog
- book
- catalogue
- conference-paper
- conference
- data
- database
- dictionary
- edited-work
- encyclopedia
- film-broadcast
- generic
- government-document
- grant
- hearing
- historical-work
- legal-case
- legal-rule
- magazine-article
- manual
- map
- multimedia
- music
- newspaper-article
- pamphlet
- patent
- personal-communication
- proceedings
- report
- serial
- slides
- software-code
- software-container
- software-executable
- software-virtual-machine
- software
- sound-recording
- standard
- statute
- thesis
- unpublished
- video
- website
required: true
description: The type of the work.

usage:

preferred-citation:
    type: generic

references:
  - type: generic

`definitions.reference.url`

type: definitions.url
required: false
description: The URL of the work.

usage:

preferred-citation:
  type: generic
  url: "https://citation-file-format.github.io/"

references:
  - type: generic
    url: "https://citation-file-format.github.io/"

`definitions.reference.version`

type: definitions.version
required: false
description: The version of the work.

usage:

preferred-citation:
  type: generic
  version: 0.3.12

references:
  - type: generic
    version: 0.3.12

`definitions.reference.volume`

type: Nonempty string or integer
required: false
description: The volume of the periodical in which a work appeared.

usage:

preferred-citation:
  type: generic
  volume: "5"

preferred-citation:
  type: generic
  volume: 5

references:
  - type: generic
    volume: "5"

references:
  - type: generic
    volume: 5

`definitions.reference.volume-title`

type: Nonempty string
required: false
description: The title of the volume in which the work appeared.

usage:

preferred-citation:
  type: generic
  volume-title: "Volume II: How it went on"

references:
  - type: generic
    volume-title: "Volume II: How it went on"

`definitions.reference.year`

type: Nonempty string or integer
required: false
description: The year in which a work has been published.

usage:

preferred-citation:
  type: generic
  year: "2021"

preferred-citation:
  type: generic
  year: 2021

references:
  - type: generic
    year: "2021"

references:
  - type: generic
    year: 2021

`definitions.reference.year-original`

type: Nonempty string or integer
required: false
description: The year of the original publication.

usage:

preferred-citation:
  type: generic
  year-original: "1978"

preferred-citation:
  type: generic
  year-original: 1978

references:
  - type: generic
    year-original: "1978"

references:
  - type: generic
    year-original: 1978

`definitions.region`

type: Nonempty string
required: N/A
description: A region.

usage:

authors:
  - name: "The Research Software Project"
    region: Renfrewshire

`definitions.swh-identifier`

type: string with pattern ^swh:1:(snp|rel|rev|dir|cnt):[0-9a-fA-F]{40}$
required: N/A
description: The Software Heritage identifier (without further qualifiers such as origin, visit, anchor, path). Note: Software Heritage identifiers are documented here: https://docs.softwareheritage.org/devel/swh-model/persistent-identifiers.html.

usage:

identifiers:
  - type: swh
    value: "swh:1:rev:309cf2674ee7a0749978cf8265ab91a60aea0f7d"

`definitions.tel`

type: Nonempty string
required: N/A
description: A telephone number.

usage:

authors:
  - family-names: Druskat
    given-names: Stephan
    tel: +12-345-6789098

authors:
  - name: "The Research Software Project"
    tel: +12-345-6789098

`definitions.url`

type: Nonempty string
required: N/A
description: A URL. Supported URLs start with one of:
- https://
- http://
- ftp://
- sftp://

usage

url: "https://citation-file-format.github.io/"

authors:
  - name: "The Research Software Project"
    website: "https://research-software-project.org"

references:
  - type: generic
    url: "sftp://files.research-software-project.org"

`definitions.version`

type: Nonempty string or number
required: N/A
description: The version of a work.

usage:

version: "1.2.0"

version: 1.2

version: "21.10 (Impish Indri)"

Files

schema-guide.md

Latest commit

History

schema-guide.md

File metadata and controls

Guide to Citation File Format schema version 1.2.0

General structure of a CITATION.cff file

Minimal example

Typical example

Referencing other work

Credit redirection

Valid keys

Index

abstract

authors

cff-version

commit

contact

date-released

doi

identifiers

keywords

license

license-url

message

preferred-citation

references

repository

repository-artifact

repository-code

title

type

url

version

Definitions

Index

definitions.address

definitions.alias

definitions.city

definitions.commit

definitions.country

definitions.date

definitions.doi

definitions.email

definitions.entity

definitions.entity.address

definitions.entity.alias

definitions.entity.city

definitions.entity.country

definitions.entity.date-end

definitions.entity.date-start

definitions.entity.email

definitions.entity.fax

definitions.entity.location

definitions.entity.name

definitions.entity.orcid

definitions.entity.post-code

definitions.entity.region

definitions.entity.tel

definitions.entity.website

definitions.fax

definitions.identifier

definitions.identifier-description

definitions.license

definitions.license-enum

definitions.orcid

definitions.person

definitions.person.address

definitions.person.affiliation

definitions.person.alias

definitions.person.city

definitions.person.country

definitions.person.email

definitions.person.family-names

definitions.person.fax

definitions.person.given-names

definitions.person.name-particle

definitions.person.name-suffix

definitions.person.orcid

General structure of a `CITATION.cff` file

`abstract`

`authors`

`cff-version`

`commit`

`contact`

`date-released`

`doi`

`identifiers`

`keywords`

`license`

`license-url`

`message`

`preferred-citation`

`references`

`repository`

`repository-artifact`

`repository-code`

`title`

`type`

`url`

`version`

`definitions.address`

`definitions.alias`

`definitions.city`

`definitions.commit`

`definitions.country`

`definitions.date`

`definitions.doi`

`definitions.email`

`definitions.entity`

`definitions.entity.address`

`definitions.entity.alias`

`definitions.entity.city`

`definitions.entity.country`

`definitions.entity.date-end`

`definitions.entity.date-start`

`definitions.entity.email`

`definitions.entity.fax`

`definitions.entity.location`

`definitions.entity.name`

`definitions.entity.orcid`

`definitions.entity.post-code`

`definitions.entity.region`

`definitions.entity.tel`

`definitions.entity.website`

`definitions.fax`

`definitions.identifier`

`definitions.identifier-description`

`definitions.license`

`definitions.license-enum`

`definitions.orcid`

`definitions.person`

`definitions.person.address`

`definitions.person.affiliation`

`definitions.person.alias`

`definitions.person.city`

`definitions.person.country`

`definitions.person.email`

`definitions.person.family-names`

`definitions.person.fax`

`definitions.person.given-names`

`definitions.person.name-particle`

`definitions.person.name-suffix`

`definitions.person.orcid`

`definitions.person.post-code`

`definitions.person.region`

`definitions.person.tel`

`definitions.person.website`

`definitions.post-code`

`definitions.reference`

`definitions.reference.abbreviation`

`definitions.reference.abstract`

`definitions.reference.authors`

`definitions.reference.collection-doi`

`definitions.reference.collection-title`

`definitions.reference.collection-type`

`definitions.reference.commit`

`definitions.reference.conference`

`definitions.reference.contact`