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[xsl] Preceding siblings test

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Hi,

I'm still a novice at XSLT and am having a problem coming up with a test for
elements preceding a particular element, but only up to the first occurrence
of the same (or parent) element.  For example, in this XML:

<list>
<a/>
<item>...</item>
<b/><b/><a/>
<item>...</item>
<item>...</item>
<a/><a/>
<item>...</item>
</list>

Assume in this example, <a> and <b> elements can occur before each item (any
number of each).  When I start processing an <item>, how do I get a list of
just those nodes before the first preceding <item> or parent <list> element?

Thanks,
Dave Hintz
Siemens

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