On Fri, 20 May 2005 12:02:18 +0100, "David Carlisle"
<davidc(_at_)nag(_dot_)co(_dot_)uk>
said:
//*[(_at_)id=$from-id]
That's a bit expensive (and you do it twice) if your file has a dtd and
these are ID attributes you could use id($from-id) or if not you could
set up an equivalent key and do the same thing.
Oh, yes. I haven't got a DTD (yet). I was going to change the code I
posted to include the id() function so y'all didn't think I was stupid;
but then I forgot. So, evidently, I *am* stupid. Oh, well...
id($from-id)/ancestor::*[(name()='section' or name()='document')
You could write that as
id($from-id)/ancestor::*[self::section or
self::document][(_at_)display='page']
Right. This works (just goes to show how little I really understand
XPath!)
or even, since this is xpath2
id($from-id)/(ancestor::*section|ancestor::document)[(_at_)display='page']
although I would guess this causes the system to do more node
re-ordering (or perhaps it just get re-written back to the self:: form
anyway)
Hmm, yes that was a bit weird.
You are generating long paths going up to the top and down again
however once you have the two sets of attribute nodes then you could use
the xpath2 except operator to prune the nodes that are in both sets s
so you only need to go up as far as the first ancestor that is shared
between from-id and to-id.
Yes, thats right. I think I did say I was doing it like that; but not
because I thought that was a good way of doing it - just an easy way.
Yet again, my ignorance of XPath comes through: I never knew there were
intersect and except operators! (I wonder if XPath ignorance is
widespread or whether its just me? Is XPath difficult? I get on with C
all right and regular expressions are easy, but I often seem to get
stuck with XPath. Does anyone else feel like this?.....)
Cheers for your comments!
Richard
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