[xquery-talk] reconstructing missing attributes

[Howard Katz]

Thanks. At least I'm happy to say it's definitely not the old familiar Doh!
experience, since Doh! usually stands for: I knew that! Not in this case.
I've never had occasion to use preceding-sibling before (tho I've
implemented it). Nicely done (tho the second variation gives me a headache).

Howard

 > -----Original Message-----
 > From: talk-bounces at xquery.com 
 > [mailto:talk-bounces at xquery.com] On Behalf Of David Carlisle
 > Sent: February 7, 2006 5:49 PM
 > To: howardk at fatdog.com
 > Cc: talk at xquery.com
 > Subject: Re: [xquery-talk] reconstructing missing attributes
 > 
 > 
 > If your processor supports preceding-sibling then it's easy:
 > 
 > <x>
 > {/x/*/element {name()} {(.|preceding-sibling::*)[@id][last()]/@id}}
 > </x>
 > 
 > $ saxon8q -s abc.xml abc.xq
 > <?xml version="1.0" encoding="UTF-8"?>
 > <x>
 >    <a id="1"/>
 >    <a id="1"/>
 >    <a id="1"/>
 >    <a id="2"/>
 >    <b id="2"/>
 >    <b id="2"/>
 >    <b id="2"/>
 >    <c id="2"/>
 >    <a id="3"/>
 >    <a id="3"/>
 >    <b id="3"/>
 >    <c id="3"/>
 >    <c id="3"/>
 >    <a id="4"/>
 >    <a id="4"/>
 >    <a id="4"/>
 >    <a id="5"/>
 >    <b id="5"/>
 >    <b id="5"/>
 >    <a id="6"/>
 > </x>
 > 
 > if not it's slightly more tiresome but you can always 
 > rewrite the axis
 > in terms of <<
 > 
 > fullaxis.xsl rewites the above to
 > <x>
 > {//x/*/ element {name()}{(. |
 > (let $here := . return
 >    reverse(../*[. << $here]))
 > /.)[@id][last()]/@id}}
 > </x>
 > 
 > for example (which gives the same result in saxon)
 > 
 > David
 > 
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