ISO 12620 data categories section 04

Section 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

DXLT representation: <descrip type='subjectField'>...</descrip>, where 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--Part of 4.2 classification Number in DXLT representation

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

Note 1: For definition of related term, see ISO 5127-6:1983, 3.4.3.1-01