Root element of the file defining a Thesaurus in the BS8723-5-Core format. Makes the identifier of the custom types of equivalence unique. Makes the identifier of the terms unique. Validates the references to broader concepts. Validates the references to narrower concepts. Validates the references to narrower concepts. Data type defining the structure of a Thesaurus in the BS8723-5-Core format Concepts composing the Thesaurus Make the identifier of the terms unique. Make the identifier of the preferred terms unique. Make the identifier of the non-preferred terms unique. Validates the "Use For" references. Validates the "Use" relationships. Data type defining the structure of a concept in the BS8723-5-Core format Preferred term of the concept. Non-preferred terms of the concept. Reference to the broader concepts of this concept. Reference to the narrower concepts of this concept. Reference to the related concepts of this concept. Data type defining the structure of scope notes in the BS8723-5-Core format Data type defining the structure of a preferred term in the BS8723-5-Core format References the non-preferred terms of the concept. Data type defining the structure of non-preferred term in the BS8723-5-Core format References the preferred term of the concept.