This is the home page for the National Science Digital Library Metadata Registry.
The Metadata Registry provides services to developers and consumers of controlled vocabularies and is one of the first production deployments of the RDF-based Semantic Web Community's Simple Knowledge Organization System (SKOS)
The CSA/NBII Biocomplexity Thesaurus is now available via a Web services (SOAP) interface. A description of the contents of the thesaurus are available on the NBII Web site at http://thesaurus.nbii.gov/.