Re: [plcs-dex] Representing parts Issue RBN-13

[Per-Åke Ling <per-ake.ling@eurostep.com>]

There is a problem with the ids on part_version: Consider a part 
identified with XYZ4711, an three part_versions connected to it: v1, v2 
and v3:

part:  <----------------------+---- part_version
id: XYZ4711                   |     id: v1
                               |     part_version
                               +---- id: v2
                               |     part_version
                               +---- id: v3

However, in PLCS there is no way to relate the ids so we cannot 
establish which version id goes with which part id:

Multiple ids:

part:  <--------------------------- part_version
id: XYZ4711                         id: v1
id: ABC13                           id: 1.0
id: 04517                           id: A1

There is no way to show that the complete id is XYZ4711 v1, ABC13 A1, 
and 04517 1.0 as opposed to e.g. ABC13 v1. An obvious but annoying 
solution is to write the full id for the part, e.g. 'XYZ4711 v1', but it 
is not only redundant, it is also counterintuitive as the _part_ is 
XYZ411 and the _version_ is v1, not 'XYZ4711 v1'.

Unfortunatey I cannot see a way around this.

Regards,
Per-Åke Ling

Tim Turner wrote:
> In the interest of visibility My response & comments to the issue are 
> provided below
> 
> *Issue: RBN-13 by Rob Bodington (05-07-27) minor_technical issue*
> 
> Should the part_version and Part view definition have an assigned id or 
> should the id attribute be used?
> 
> *TJT Response:* As version code identifiers for a part and their 
> respective view definitions may also change over time we should use an 
> assigned id. This will then be consistent with how we treat identifiers 
> as described in C001.
> 
> Any additional comments welcome.
> 
> regards,
> Tim
> 
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