Iran is a founding member of the Group of 15.
In computer metadata , semantic equivalence is a declaration that two data elements from different vocabularies contain data that has similar meaning .. metadata. metadata. There are three types of semantic equivalence statements  :. Class or concept equivalence .. Class. Class ( computer science ). concept. concept. A statement that two high level concepts have similar or equivalent meaning .. Property or attribute equivalence .. Property. Property ( philosophy ). attribute. Attribute ( computing ). A statement that two properties , descriptors or attributes of a classes have similar meaning .. Instance equivalence .. Instance. Object ( computer science ). A statement that two instances of data are the same or refer to the same instance .