User:Realworldobject/sandbox: Difference between revisions

BiblioGraph.net (BGN) is an extension to Schema.org that was designed for richer descriptions of bibliographic resources^[1]. This "external" extension was effectively replaced in May 2015 by the "hosted" extension bib.schema.org^[2], although the efforts haven't been fully reconciled.

Although libraries were early adopters of RDF and linked data^[3][4][5], they tended to be localized namespace mashups that focused on identifier and terminology reuse rather than coordinated 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^[6] lacked documentation and examples.

In response, the W3C Schema Bib Extend Community Group^[7] 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."^[8] The group met regularly between December 2012 and February 2014^[9] to document use cases, define scope, and propose extension terms.^[10]

Although other communities also proposed additions to Schema.org, the process remained restrictive compared to industrial needs.^[11] 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^[12] was published on July 17, 2014 as BiblioGraph.net^[13].

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^[14]. Among the initial hosted extensions was bib.schema.org^[15] 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.

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.

Although Schema.org and its extensions have limited capabilities as illustrated above, more complete coverage of BiblioGraph.net can be found using Wikidata and declared 'equivalent class' (P1709)^[16], and 'equivalent property' (P1628) claims^[17].

PREFIX bgn: <http://bibliograph.net/>
SELECT ?item ?bgn ?propLabel
WHERE {
  VALUES ?p {
    wdt:P1709
    wdt:P1628
  }
  ?prop wikibase:directClaim ?p .
  ?item ?p ?bgn .
  FILTER(STRSTARTS(STR(?bgn), STR(bgn:)))
  BIND(STRAFTER(STR(?bgn), STR(bgn:)) AS ?term)
  SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
}
ORDER BY ?propLabel ?term

Click here to launch the Wikidata query

• Homepage URL: https://Bibliograph.net