In 2009 I suggested to map Wikidata categories to library classifications. This has been done in some Wikipedia editions for a few hundered Wikipedia categories(for instance in English Wikipedia. The mappings should better come from Wikidata.
Example:Category:Algebra is linked to Algebra which has mappings to library classifications (DDC, LOC, UDC; Bliss and Colon have no Wikidata property yet).
In 2009 I suggested to map Wikidata categories to library classifications. This has been done in some Wikipedia editions for a few hundered Wikipedia categories(for instance in English Wikipedia. The mappings should better come from Wikidata.
Example: Category:Algebra is linked to Algebra which has mappings to library classifications (DDC, LOC, UDC; Bliss and Colon have no Wikidata property yet).
P.S. Partly done, see Category:Algebra and the Template!