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RE: Extracting a list of unique base urls from anchors in a html docu ment.


Hi David,

Thanks for the reply.

This is an example from XSLT Prog.Ref 2nd. ed.:
(On page 624)

/cities/city[not(@country=preceding-sibling::city/@country)]

I'm propably wrong, but to me, the above expression and mine seem similar.
Both compare the string value of the attribibute of the context node with
the values of the preceding tree.

The only difference is that my template doesn't compare the attribute values
as-is, but applies a substring before doing so.

In above template two string values are compared as well. Does it make a
difference that these values aren't processed by substring()

Thanks,
// tt

> 
> > The second predicate should (I think) limit the returned 
> node-set to contain
> > only anchors that have a href attribute that has a unique base-url 
> 
> No as 
> [not(substring-before(@href,'#')=substring-before(preceding::a
> /@href,'#'))]
>                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> 
> this takes the string value of the node set which is the 
> string value of
> the first node, so that only tests the current href attribute with the
> first href attribute in the document, not with all the preceding ones.
> 
> This is really a grouping broblem see th egrouping techniques 
> at Jeni's
> site.
> 
> Basically you want to construct a key that uses
> match="a[contains(@href,'#')" use="substring-before(@href,'#')"
> then using key() you can get hold of all the links with the same base.
> 
> David
>  
> 
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