Validate <meta> metadata

[tomschr]

Problem Description

We introduced metadata which is added as the <meta> element. However, these tags aren't validated nor does it guide XML editors.

Expected Behaviour

Make GeekoDoc v2 aware of the respective tags. If feasible, add also limitations to the respective <meta> element.

Related information

• Investigate additional Schematron Rules for GeekoDoc #6
• SEO-related tweeks: OG and TwitterCard descriptions suse-xsl#480
• https://jira.suse.com/browse/DOCTEAM-865
• https://lists.oasis-open.org/archives/docbook/202301/msg00000.html

[tomschr]

I've tested a minimal example:

default namespace db = "http://docbook.org/ns/docbook"
datatypes xsd = "http://www.w3.org/2001/XMLSchema-datatypes"
datatypes dtd = "http://relaxng.org/ns/compatibility/datatypes/1.0"

include "docbook.rnc" {}

div{
  db.meta.title.attlist =
      attribute name {
        ## A title for SEO (max 55 characters)
        "title"
        }
      & db.meta.role.attribute?
      & db.common.attributes
      & db.common.linking.attributes

  db.meta.title =
      ## A title for SEO (max 55 characters)
      element meta {
         db.meta.title.attlist,
         xsd:token { maxLength = "55" }
      }

  db.meta.description.attlist =
      attribute name {
        ## A short SEO description, max. 150 chars
        "description"
      }
      & db.meta.role.attribute?
      & db.common.attributes
      & db.common.linking.attributes

  db.meta.description =
      ## A short SEO description, max. 150 chars
      element meta {
        db.meta.description.attlist,
        xsd:token { maxLength = "150" }
      }
}

db.meta |= (db.meta.title | db.meta.description )

However, jing seems not to check the length of an element like:

<!-- 60 characters: should be invalid -->
<meta name="title">xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx</meta>

<!-- 10 characters: should be valid -->
<meta name="title">xxxxxxxxxx</meta>

Both are correct for jing. 😞

---

Jing version: 20151127 and 20220510 (both fail)
OS: openSUSE Leap 15.4

[tomschr]

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