Relationships and relative references in OPC parts

[MURATA Makoto]

Dear colleagues,

There are two ways for a part to reference to another part
or external resource.  One is to directly specify a (possibly
relative) IRI reference.  The other is to create a relation
whose target is what we want to reference, and then
specify the id of the relationship within the current
part.

Why do we have these two mechanisms?  In my understanding,
relations provide one advantage: we only have to rewrite
relationship parts when part names are changed or external
references have new URIs.

However, this advantage is never stated in 29500-2.  I think
that the upcoming revision should make this advantage
clear.

Regards,
Makoto

-- 

Praying for the victims of the Japan Tohoku earthquake

Makoto
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