Re: XPointer crisis
Christian Nentwich wrote: > > > > reference) a DTD, W3C XML Schema, or other infoset-augmenting > > > > resource. As an added bonus, the recipient doesn't have to > > > > retrieve (and process!) the DTD/XSD/what-have-you. > > > As a negative, the ID values won't be in a hashtable after parsing, > > Why wouldn't they be? An XML parser could still build an > > index from known ID-bearing attributes, and use the index > > when possible. There's no reason why an application > > But the point of this argument was that xml:id was not necessary.. Ah. I've been arguing that barenames in XPointer aren't necessary; xml:id would be useful and might be necessary for some *other* reason, I just don't think it should be required as a prerequisite for XPointer support. > how can the parser know which attributes are ID-bearing without a DTD, > XSD, or xml:id attribute? It shouldn't have to know which attributes are ID-bearing. If it does happen to know -- by way of xml:id, a DTD, XSD, or whatever -- then it *may* use that knowledge to optimize '//*[@attname=attval]' -- but such knowledge isn't necessary. On the other hand, it *must* know which attributes are ID-bearing to process 'id(foo)' at all. So I believe that XPointer *should not* include any constructs which are equivalent to the XPath 'id()' function. > Or was your intention to suggest that the application should build the > hashtable? In that case, I would be disappointed if the parser didn't do > it for me, because it's a very common operation and I'm lazy. No, I think that index-building should be handled at the parser/toolkit layer, not the application layer. But it should also be possible to implement XPointer on top of a toolkit that *doesn't* have this capability. That's all. --Joe English jenglish@f...
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