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RE: [xsl] Test processing instruction as first preceding sibling

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>         I have a doubt about testing preceding-sibling 
> processing-instruction.
>         I have this xml:
> 
>        <root>
>            <child1>
>                    child 1
>            </child1>
>            <?proc?>
>            <child2>
>                   child 2
>           </child2>
>      </root>
> 
>            And I need to know if child2 has the first 
> preceding-sibling as a processing-instruction. 

This needs care because the immediately preceding sibling is actually a
whitespace text node. If you've used xsl:strip-space to remove such text
nodes, it's

test="preceding-sibling::node()[1][self::processing-instruction()]"

but if you need to ignore such text nodes then it's

test="preceding-sibling::node()[not(self::text()[normalize-space()=''])][1][
self::processing-instruction()]"

Michael Kay
http://www.saxonica.com/

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