295 Presence attribute

Created: 22 Feb 2006

Status: Not Applicable

Part: Part 7-2 (2003)

Links:

Page:

Clause: 10

Paragraph:

Category: Issue for edition 2 of this part

Issue

What is the purpose of the "presence" attribute? It is defined in 7-2, but 8-1 does nothing with it, and it is not managed or supported in the SCL of Part 6.

Proposal

Explain its purpose further (including why it is defined but not actually used), use/manage/support it, or delete it.

Discussion	Created	Status
The meaning of the 'presence' attribute is explained in7-2 clause 5.5.1. As it indicates if a data is optional or mandatory, it is not contained in SCL, because SCL types only describe existing (instantiable) attributes, not optional ones. If you want to extend the SCL usage to describe class definitions inclusive optional attributes, you can use the SCL extension defined in part 6 annex C.2, where the 'presence' attribute is called mop (mandatory / optional / private)	23 Feb 06	Not Applicable

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