292   Explanation of r and w

Created: 14 Feb 2006

Status: In Force (green)

Part: Part 8-1 (2004)

Links:

Page: 18

Clause: 4

Paragraph:

Category: Issue for edition 2 of this part

Issue

Clarify the characteristics of "r" and "w"

Proposal

"r" means readable, but not necessarly read only
"w" means writeable, but not necessarly write only

Discussion Created Status
31 Mar 06 In Force (green)
changed to final proposal 24 Feb 06 Ballot Period
The definitions of "r" and "w" can be found in clause 4. These will be clarified. Additionally, add "rw" definition.

"r = mandates that the item is readable. The ability to write the item is a local issue."

"rw"= Mandates that the item is both readable and writeable."

"w = Mandates that the item is writeable. The ability to read the item is a local issue."

16 Feb 06 Discussion (red)
The proposal does not consider different usages, i.e. the scope is not clear. The proposal's meaning is acceptable as a requirement from the standard, e.g.: "r" means, the considered data/attribute shall be readable, it may additionally be writeable.
In the context of a description of an implementation however, a 'may perhaps' is not allowed. Here an "r" means readable and nothing else, and if it is also writeable, then a "w" must be added additionally. This means that a standard formalism working with 'but may also' can not be used to describe an implementation (instance) of the standard. 		16 Feb 06 Discussion (red)

 

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