ISO/TS 29002-20:2010 specifies an interface to retrieve
information from a concept dictionary. Three sets of capabilities,
called "services", are defined:

• Location Service: given a registration authority identifier,
  returns location on the Internet of Terminology and Ontology
  servers for the registration authority;

• Terminology Service: searches for concepts, languages, and other
  elements of the dictionary based on a rich set of keywords, search
  criteria, and expressions; given an international registration data
  identifier (IRDI) in the format defined in ISO/TS 29002-5,
  retrieves terminological information;

• Ontology Service: retrieves ontological information about a
  concept based on the concept's IRDI.