Industrial automation systems and integration —
Product data representation and exchange —
Part 43:
Integrated generic resource: Representation structures

1 Scope

• the specification of contexts for representation;
• the specification of elements of representation;
• the association of elements of representation with one or more contexts in which they are combined to represent a concept;
• the association of elements of representation such that one defines another;
• a structure for relating two representations such that one participates in the definition of the other;
• a structure for relating two representations in which one does not participate in the definition of the other;
• constraints to prevent the recursive definition of instances of an element of representation;
• the specification of the transformation of one element of representation to another by specifying the input and output of the transformation;
• the specification of the transformation of one element of representation to another by specifying the transforming function.

The following are outside the scope of this document:

• the complete specification of types of representation, types of elements of representation, and types of representation context;
• the specification of the uses of representation;
• the association of representation with any of its possible uses;
• constraints requiring a directed relationship between representations;

  NOTE    A directed relationship exists between items A and B if the meaning of the relationship of A to B is different from the meaning of B to A. A and B are peers in a non-directed relationship. A directed relationship can be specified in an annotated EXPRESS schema that uses or specializes this schema.

• constraints forbidding cyclic structures of related representations;
• constraints requiring a directed relationship between the contexts in which related representations exist;
• constraints forbidding cyclic structures of relationships between representation contexts.

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