OCLC has been experimenting with linked data for several years. For example, the top-three levels of the Dewey Decimal Classification have been available as linked data for several years, with the full set released in June 2012. The Virtual International Authorities File (VIAF) and Faceted Application of Subject Terminology (FAST) have also been published as linked data.
In June 2012 OCLC dramatically increased its exposure of linked data resources by making WorldCat.org bibliographic metadata available in this form. In order to do this, Schema.org mark up & library extensions have been added to Worldcat.org for the entire cataloging collection (book and journal titles primarily; not journal articles added through third party providers). This provides improved functionality for our harvest partners and those writing widgets that require structured data exposed within HTML pages (via RDFa 1.1)
Using the Schema.org ontology, extended by a proposed Library Ontology, as a basis for modeling WorldCat bibliographic data will enable fullest coverage and consumption of this data by search engines and other systems. More detailed information about the vocabulary used by WorldCat.org linked data is available.
The Experimental Linked Data Release is made available by OCLC under the Open Data Commons Attribution License, with reference to the community norms of the library members of the OCLC cooperative who built WorldCat.
Please note that this is not a static release, but an initial experimental release that will be changed over time as we receive feedback from the library and wider web communities. In order to facilitate discussion and feedback we've created a public discussion group. Community members can join by logging into the Developer Network site, visiting the group page, and selecting the Join link. Additionally, it is possible to subscribe to the group's activity via RSS feed.
We are aware that this initial experimental release is not necessarily where we hope to end up and we will be working to improve it incrementally. To begin with, here are some issues we have identified and for which we will be seeking solutions with community involvement where appropriate:
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