[OGSA-BES-WG] [ogsa-hpcp-wg] To many 'any' in factory attributes document

[Peter G. Lane]

Donal K. Fellows wrote:
> Christopher Smith wrote:
>> I don't know if others are having this issue, but my tooling doesn't like
>> all the xsd:any that show up in the FactoryResourceAttributesDocumentType.
> [...]
>> That makes two xsd:any in one complex type, which is one too many in my
>> opinion. 
>>
>> Can we perhaps refactor this type? I've also noticed that I can only provide
>> one OperatingSystem, CPUArchitecture, etc, etc, which doesn't allow me to
>> list the elements of my cluster.
> [...]
>> Even if we don't refactor like I suggested, we need to control the
>> xsd:any's.
> 
> I've hit this before and it is distinctly unpleasant. The problem is
> that the XML Schema specification is very weak in this area; the schema
> working group doesn't seem to view things in quite the same way as the
> rest of the world. :-\
> 
> There does appear to be a way to get what you want within the model of
> the schema, and that is to first use complex type restriction to strip
> the xs:any to make a "trimmed base type", and then extend that with the
> extra elements, finishing off with the xs:any. The main down-sides of
> this are that it is ugly and who knows how anyone's tooling copes with it?

Or simply start out with a non-any complexType that both the basic and full resource attributes 
types extend.

> 
> Myself, I've tended to end up writing out the whole document type in
> full when I've had to do that sort of thing instead, and only adding the
> xs:any at the end by a final stage to apply it. But that's disgusting in
> other ways.
> 
> As a side note, this is compatible with WS-ResourceProperties 1.2, but I
> know that at least one implementation would have choked on it at one
> point since this is getting into the wilder parts of schema processing.
> 
> Now I need to floss my brain. Too much reading of W3C specs!
> 
> Donal.
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