culturegraph.org is a Linked Open Data service which deals with minting common identifiers (Uniform Resource Identifiers) for cultural works (books and other text, paintings, sculptures, piece of music etc.) to ensure these resources’ reliable and persistent referenceability.
This service (still in its infancy) addresses the fact that one and the same resource has multiple identifiers for metadata – library control numbers as well as publisher’s or bookseller’s IDs like Amazon Standard Identification Number (ASIN) and URI’s stemming from Linked Data efforts. Tying these identifiers together and linking among them is great, but so would be pulling together all the bibliographic descriptive data. Creating *yet another* URI for a certain resource description contributes to the URI synonymy issue (“many URIs for one thing”), but I suppose it serves as an umbrella under which the data can be aggregated.
In any case, it’s good not to neglect already existing non-URI identifiers in information integration, although it seems everything must have a URI these days ;).