This page describes some of the sources of schema.org vocabulary.
See IPTC rNews / schema.org guide for details of the IPTC / rNews schema.org vocabulary.
See also schema.org blog.
GoodRelations Vocabulary for E-Commerce
The GoodRelations Vocabulary is a powerful conceptual model for exposing e-commerce data on the Web, e.g. details about products, stores, companies, offers, and much more. It has been developed and maintained by Martin Hepp since 2002 and is widely adopted. The sponsors of schema.or and Martin Hepp are working on integrating GoodRelations into schema.org. This means that you will be able to use GoodRelations directly from the schema.org namespace. GoodRelations will remain an independent activity and can be used in a variety of syntaxes, including RDFa, RDF/XML, Turtle, OData, GData, etc. See this page for details about the integration.
Automotive Ontology Working Group
The Automotive Ontology Working Group is an informal group of individuals and corporations who want to advance the use of shared conceptual structures in the form of Web ontologies for better data interoperability in the automotive industry, and this at Web scale. Part of the work will result in extension proposals for schema.org.
Bibliographic Ontology Specification
The Bibliographic Ontology Specification (bibo) provides classes and properties for describing citations and bibliographic references (books, articles, etc). schema.org has attempted to align itself with bibo where possible, and used properties such as bibo:pageEnd, bibo:pageStart, and bibo:pages as the basis of schema.org properties.