SPARQL QUDT to DSI extractor test

Disclaimer

Please be aware that the source code provided in this repository is work in progress and doesn't claim to be correct or complete by any means.

Goal

• prototypical proof-of-concept implementation to see, whether the conversion is possible at all
• aims to provide a DSI-string for (a selected subset of) the QUDT-units, e.g. to provide this to a user / LaTeX-engine

Run the Code

Try the SPARQL code by copying it into the interface of: https://www.qudt.org/fuseki/#/dataset/qudt/query

Alternatively, for local execution you can use the provided Python scripts to download the required ontologies

python download_ontologies.py

and run them by

python execute_sparql.py

Please note, that this requires a Python environment with the packages listed in requirements.txt. The creation of a dedicated Python environment (venv, pyenv, etc. ) is highly recommended.

Known limits and issues

• only units with conversionmultiplier==1.0 and conversionoffset==0.0 considered so far (location+amount of prefixed units (e.g., mm/ms) of the prefix not clear, e.g. check m/ms = km/s )
• some units with DEG_C still show up, although offset units should be filtered?
• not considered so far: official order of quantities in DSI?
• not considered so far: dimensionless quantities like m/m

Links

• https://www.qudt.org/fuseki/#/dataset/qudt/query
• https://www.ptb.de/empir2018/fileadmin/documents/empir/SmartCom/documents_for_download/Digital_System_of_Units_D-SI_2019-11-04_UK_NPL_SmartCom.pdf
• https://ctan.org/pkg/siunitx