Integrate csvwlib to support W3C CSVW

[ceteri]

Add support for W3C CSV on the Web (CSWV).

• integrate use of csvwlib
• validate with CSVW Test suites

See also:

• https://w3c.github.io/csvw/
• https://www.w3.org/community/csvw/

[ceteri]

One example dataset for illustrating CSV import into a graph:
https://www.kaggle.com/boltcutters/food-allergens-and-allergies?select=FoodData.csv

[ceteri]

NB: while the W3C CSVW impl in Py is much appreciated, the structure of csvwlib is something we might refactor, while preserving the same calling interface that it exposes currently:

• publishes the CSVWConverter class, which has required parameters embedded inside its logic
• data access is only through URLs, not files

[ceteri]

See also: https://rdflib.readthedocs.io/en/stable/_modules/rdflib/tools/csv2rdf.html

[ceteri]

This looks interesting... https://github.com/CLARIAH/COW

[ceteri]

COW has loads of extras, and appears to be leaning much toward CLI use. Would be more difficult to integrate.

[ceteri]

There are also means of translating tabular data to RDF, much more lightweight and simple to use than RML, which would complement CSVW:

• https://github.com/SemanticComputing/CSV2RDF
• https://rdflib.readthedocs.io/en/stable/apidocs/rdflib.tools.html#module-rdflib.tools.csv2rdf
• https://github.com/SemanticLab/simple-csv-to-rdf
• https://github.com/danbri/csvrdfize
• https://github.com/r4isstatic/csv-to-ttl