User:Realworldobject/sandbox

BiblioGraph.net (BGN) is an extension to Schema.org that was developed for richer descriptions of bibliographic resources. This "external" extension was effectively replaced in May 2015 by the "hosted" extension bib.schema.org, although the efforts haven't been fully reconciled.

History
Although libraries were early adopters of RDF and linked data , they tended to be localized namespace mashups that focused on identifier and terminology reuse rather than structured data reuse. In comparison, the growing popularity of Schema.org (announced June 2, 2011) demonstrated the potential of a cross-domain namespace, intuitive terminology, simplified HTML embeddings (Microdata or RDFa) and expectations that search engine optimization would improve. Schema.org's coverage of library-related concepts was thin, however, and the original "Slash-based" extension mechanism lacked documentation and examples.

In response, the W3C Schema Bib Extend Community Group was formed on September 25, 2012 to "discuss and prepare proposal(s) for extending Schema.org schemas for the improved representation of bibliographic information markup and sharing." The group met regularly between December 2012 and February 2014 to document use cases, define scope, and propose extension terms.

Although other communities also proposed additions to Schema.org, the process remained restrictive compared to industrial needs. As an early extension alternative, Schema.org made their underlying software available as open source allowing Schema.org to be treated as the core, but with greater local control over the extensions. By using this software platform, the complete set of Schema Bib Extend proposals was published on July 17, 2014 as BiblioGraph.net.

Although the shared software platform potentially allowed communities to manage extension like BiblioGraph.net with more agility and independence, pressure remained on Schema.org to deal with extensions in a more centralized way. In May 2015, Schema.org announced a new "hosted" extension mechanism replacing the original "slash-based" mechanism. Among the initial hosted extensions was bib.schema.org which effectively subsumed the purpose of the "external" BiblioGraph.net. The two efforts were never fully reconciled, although the W3C Schema Bib Extend Community Group subsequently targeted bib.schema.org and development on BiblioGraph.net ceased.

BiblioGraph.net Terms
The set of BiblioGraph.net extension terms fall into three categories. Terms that map to the hosted bib.schema.org extension are highlighted, although many gaps remain.

Wikidata Equivalencies
Although Schema.org and its extensions have limited capabilities as illustrated above, more complete coverage can be found using Wikidata and declared 'equivalent class' (P1709), and 'equivalent property' (P1628) claims. Wikidata classes and properties are not designed to be used outside of Wikidata itself, but they can be used as a hub for finding equivalencies in other namespaces. To the extent that search engines consume Wikidata in addition to crawling Schema.org markup on the web, some of the potential of search engine optimization can still be realized.