FAQ

Q: What data formats can the SDM-RDFizer convert? A: The SDM-RDFizer can convert the following data formats:

Q: How are the transformation rules defined? A: The SDM-RDFizer follows the transformation rules defined by RML. (https://rml.io/specs/rml/)

Q: How is the SDM-RDFizer configured? A: The SDM-RDFizer requires a configuration file. The configuration file has the following fields:

main_directory: The folder where the mapping and data sources are located.
number_of_datasets: The number of datasets to be converted.
output_folder: The location where the output will be generated.
remove_duplicate: Remove duplicates from the output.
all_in_one_file: If there are multiple datasets, the SDM-RDFizer can generate only one output file.
name: Name of the output file.
enrichment: When removing duplicates the SDM-RDFizer has two settings. If set to “yes”, the SDM-RDFizer uses hash tables for the storage of the generated triples (best performance). If set to “no”, the SDM-RDFizer uses arrays for the storage of the generated triples.
mapping: The location of the mapping.

Q: How can I run the SDM-RDFizer? A: We have two ways of running the SDM-RDFizer:

From the terminal: python3 rdfizer/run_rdfizer.py /path/to/configfile
Docker container: Building docker container. Note: All documents in the same folder of the Dockerfile will be copied to the container.

docker build -t rdfizer .

- To run the application, you need to map your data volume to “/data” folder of the container where data, mappings and config files should be located:
- - docker run -d -p 4000:4000 -v /path/to/yourdata:/data rdfizer
- Send a POST request with the configuration file to RDFizer the file
- - curl localhost:4000/graph_creation/data/your-config-file.ini
- Get the results from container (if output folder is inside data folder, results are already in your host)
- - docker cp CONTAINER_ID:/app/path/to/output .
- Instead of installing from scratch, you can use the docker image we provide: (https://hub.docker.com/repository/docker/sdmtib/sdmrdfizer-server)

Q: Where can I take a look at the experimental evaluations ran over SDM-RDFizer? A: The experimental evaluation can be seen here: https://github.com/SDM-TIB/SDM-RDFizer-Experiments/

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