Re: Insert an new Element on a attribute value change

Firstly this is essentially a grouping problem so you could do worse
than
http://www.jenitennison.com/grouping

but to answer your questions:

> How to test for the non-existance of an 
> attribute.

test="not(@foo)" or test="not(element/@foo)" if the attributes not on
teh current element. this is not special syntax it is just part of teh
general scheme of things, @foo is an Xpath which selects all attributes
called foo, a node set used in a boolean test counts as false just if
the node set is empty, which it will be in this case if there are no foo
attributes.

>  And how to select a subset of the following siblings. 
>  The rule: all following siblings until you find one with an existing 
>  attribute newchapter='true'.

This is harder in Xpath1 (and Jeni's grouping pages will show how you
can use keys to avoid answering it directly) but
you can do this as follows: firstly identify the next such element
<xsl:variable name="x" select=generate-id(following-sibling*[@newchapter='true'][1])"/>
Then select all following siblings that have the property that _their_
first following sibling is the same one:

select="following-sibling::*[generate-id(following-sibling*[@newchapter='true'][1])=$x]"

David

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