The Jangle Vocabulary is intended to provide unambiguous identifiers and definitions to provide pointers to Jangle implementers and developers to understand what data is being provided by a Jangle service.
Record formats registry (http://jangle.org/vocab/formats#)
Entity registry (http://jangle.org/vocab/Entity#)
Registry of other URIs, for use in categories, etc. (http://jangle.org/vocab/terms#)