An attribute represents a characteristic of the meaning of a concept or the nature of a refinement.

An attribute has a name which is represented by a concept. All the concepts that can be used to name attributes are subtypes of the concept | concept model attribute |. An attribute is assigned a value ( attribute value pair) when used in the definition of a concept or in a postcoordinated expression. The permitted range of values depends on the rules specified in the concept model.

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