[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Annotations in XPath-NG? (Re: XPath/XSLT 2.0 co
Hi Tom, >> Personally I'd use qualified names rather than URIs for the >> "lookup", but that's because I envisage getting to annotation >> information through an axis rather than through a function and >> because QNames are easier to write than URIs. Perhaps a function: >> >> annotations(node) >> >> that returns a node set, and let the user use XPath mechanisms for >> doing the lookup within that node set? > > I would say the function, because I see annotations as closely tied > to nodes that they annotate. If we only had an axis, we could get > annotations but it would be harder to tie them to their nodes. That > would not be so if annotation::* only returns annotations associated > with the context node, but that seems too limited to need an axis. > Otherwise I like the idea of an axis but think that there should be > a function anyway. Hmm... I think I disagree because I can imagine it might sometimes be useful to get the annotations of the same kind from a whole bunch of nodes. For example to answer the question "Does this element have any attributes with a type of xs:ID?" you might use: @*/annotation::xsi:type = "xs:ID" of course you could do the equivalent with: @*[annotations(.)/xsi:type = "xs:ID"] but then you could do the equivalent of: annotations(foo) with: foo[1]/annotation::* if you were only interested in the first foo element. I guess that I'm in favour of using axes rather than functions whenever you get a bunch of nodes returned by applying some process to a context node. But if Uche's talking about just adding extensions to XPath 1.0 then sticking with functions is a better idea. Cheers, Jeni --- Jeni Tennison http://www.jenitennison.com/
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