CLS Framework: ISO 12620 data categories section 04

4 subject field 4.1 classification system - combined with A.4.2) 4.2 classification number 4 subject field Admitted Name 1: domain Admitted Name 2: subject label Description: An area of human knowledge to which a terminological record is assigned. Example 1: The subject field for Annex C, Figure C.3 is plastics. Note: Within a database or other terminolgy collection, a set of subject fields, domains, or classification codes will generally be defined. More than one subject field can be indicated for a given concept, and subject fields can be designated hierarchically as subfields by indicating a level index. Three levels are typical, although additional levels up to 9 are practically possible. Example 2: Multiple levels Subject field (level 1): disease Subject field (level 2): cancer Subject field (level 3): non-Hodgkins lymphoma Blind MARTIF Representation: <ref type=subjectField target=YS>...</ref>, where YS is the ref id of a <refObject type=subjectFieldSet> and the content is a unique name for a subject field. Note 1: The suggested method for making the subject field unique: "medicine:instruments". Note 2: For definition of related term, see ISO 5127-6:1983, 3.4.1.02 Note 3: The classification system used in a terminology collection can appear as a header code to indicate the classification system used throughout a terminology file or document, e.g., UDC, BRT, etc., or it can vary among entries and be reported separately in each entry. The classes themselves are covered by the subject field (A.4) data category. 4.1 classification system Description: The arrangement of concepts into classes and their subdivisions to express the relations among them. Note1: For definition of related term, see ISO 5127-6:1983, 3.4.1.02 Note2: The classification system used in a terminology collection can appear as a header code to indicate the classification system used throughout a terminology file or document, e.g., UDC, BRT, etc., or it can vary among entries and be reported separately in each entry. The classes themselves are covered by the subject field (4) data category. 4.2 classification number Description: A set of symbols, with rules for their application, used to represent classes and their interrelations. Blind MARTIF Representation: <ref type=classificationNumber target=YClass>...</ref>, where YClass is an id ref of a <refObject type=classificationSystem> and the content is a unique identifier of a position in the classification system. Note 1: For definition of related term, see ISO 5127-6:1983, 3.4.3.1-01 Example: Electrical engineering might be <ref type='classificationNumber' target=UDC>621.3</ref> Note 2: If classes are represented by words instead of notation, they will probably be treated as subject field and subfield references.