UMBEL (Upper Mapping and Binding Exchange Layer) is a lightweight ontology structure for relating Web content and data to a standard set of subject concepts. Its purpose is to provide a fixed set of reference points in a global knowledge space. The API contains several services, including the ability to search for UMBEL subject concepts and find detailed information about a specific UMBEL subject concept URI. Also includes tools for listing and verifying sub-classes, as well as an endpoint for SPARQL queries.
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