Re: Test processing instruction as first preceding si

> In this case it should return true.

This implies that you wish to ignore white space text nodes, otherwise
the immediately preceding node is a text node not a PI.



> preceding-sibling::*[1]

* matches element nodes, you want


preceding-sibling::node()[1]

then to test if that is a PI, you can do

preceding-sibling::node()[1]/self::processing-instruction('proc')

This wil work for examppl eif you have already removed the white space
with 
<xsl:strip-space elements="*"/>
if you can not remove the white space as it is needed elsewhere the test
needs to be

preceding-sibling::node()[not(text()[not(normalize-space())])][1]/self::processing-instruction('proc')

David

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