Re: XPath for Infoset extensions [was Annotations in XPath-NG?
Henry S. Thompson wrote: > John Cowan and I have been pushing around the idea that it should be a > requirement on 'official' infoset extensions that they come with a > serialisation. I'd like to see this happen, for example along the > lines of the various reflections Richard Tobin and I have explored for > the PSVI. It would be a simple step to allow XPaths to navigate > extensions via a pretend reflection. All that's required is a > function 'reflect(property)', whose value would be a reflection of the > value of an infoset property of the current node. So, for instance, > to access the appinfo annotation of the type used to validate an > 'apple' element child of the current node, you'd say: > > apple/reflect("type_definition")/annotation/appinfo > > You could of course navigate the vanilla infoset this way. The > equivalent of /*/apple/@banana would look like > > /property("document_element")/children/element[local_name="apple"]/attributes/attribute[local_name="banana"] Yes, direct PSVI access would be one possible application of an annotation axis or function (as Jeni suggested with foo/#psvi:type-definition in an earlier post), but I see no point in limiting it to PSVI and PSVI only access as your reflect function suggests. Cheers, David
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