[cddlm] Doubt about "Resolve" operation on System

[Ayla Debora Dantas de Souza - Projeto Ourgrid]

Thanks Stuart and Steve for your attention.
While the deploy+cmp is not extended, a query where a prefix that is not 
declared in the CDL is used will get an empty result in our implementation.
Regards,
  OurGrid Team.

Steve Loughran wrote:

> Ayla Debora Dantas de Souza - Projeto Ourgrid wrote:
>
>> Hello all,
>>
>> we are implementing the "Resolve" operation from the System and we 
>> had the following doubts:
>> 1. What should happen if in the "path" we specify a prefix, but in 
>> the CDL being queried that prefix is not defined?
>> As far as we know, XPath does not support queries using namespaces, 
>> only prefixes. Considering this, the prefix used must be defined on 
>> the XML being queried. Are we right?
>>
>
> That is an interesting thought. you may have found a bug there.
>
> XPath always needs a context to resolve against; it takes the default 
> of a node, or you can pass in your own context of prefix,namespace pairs.
>
> I guess we'd assumed that you could just rely on the context of 
> whatever descriptor you deployed, but xpath is a lot less brittle in 
> code if you provide your own context, as then you are not so dependent 
> upon prefix names, which are, after all, just conventions.
>
> Maybe we need to extend the deploy+cmp apis to pass in a context for 
> resolution.
>
>> 2. What must happen when the "path" passed for the "Resolve" does not 
>> present a prefix?
>> We think that in this case, a response representing an emply result 
>> should be returned to the user. Ok?
>
>
> i'd probably envisaged an error, but we need to work with the 
> component model design there.
>
>>
>> Thanks,
>>
>> Ourgrid team.
>>
>