XSLT: find first element above selected element - xslt

Question

I want to get the first heading (h1) before a table in a docx.
I can get all headings with:
<xsl:template match="w:p[w:pPr/w:pStyle[#w:val='berschrift1']]">
<p>
<context>
<xsl:value-of select="." />
</context>
</p>
</xsl:template>
and I can also get all tables
<xsl:template match="w:tbl">
<p>
<table>
<xsl:value-of select="." />
</table>
</p>
</xsl:template>
But unfortunetly the processor does not accept
<xsl:template match="w:tbl/preceding-sibling::w:p[w:pPr/w:pStyle[#w:val='berschrift1']]">
<p>
<table>
<xsl:value-of select="." />
</table>
</p>
</xsl:template>
Here is a reduced XML file extracted from a docx: http://pastebin.com/KbUyzRVv
I want something like that as a result:
<context>Let’s get it on</context> <- my heading
<table>data</table>
<context>Let’s get it on</context> <- my heading
<table>data</table>
<context>We’re in the middle of something</context> <- my heading
<table>data</table>
Thanks to Daniel Haley I was able to find a solution for that problem. I'll post it here, so it is independend of the pastebin I postet below.
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:w="http://schemas.openxmlformats.org/wordprocessingml/2006/main"
xmlns:v="urn:schemas-microsoft-com:vml" exclude-result-prefixes="xsl w v">
<xsl:output method="xml" indent="yes"/>
<xsl:strip-space elements="*"/>
<xsl:template match="w:tbl">
<context>
<xsl:value-of select="(preceding-sibling::w:p[w:pPr/w:pStyle[#w:val = 'berschrift1']])[last()]"/>
</context>
<table>
<xsl:value-of select="."/>
</table>
</xsl:template>
<xsl:template match="text()"/>
</xsl:stylesheet>

Answer 1

Hard to answer without a Minimal, Complete, and Verifiable example, but try this:
<xsl:template match="w:tbl">
<p>
<table>
<xsl:value-of select="(preceding::w:p[w:pPr/w:pStyle[#w:val='berschrift1']])[last()]"/>
</table>
</p>
</xsl:template>

Answer 2

Assuming you can use XSLT 2.0 (and most people can, nowadays), I find a useful technique here is to have a global variable that selects all the relevant nodes:
<xsl:variable name="special"
select="//w:tbl/preceding-sibling::w:p[w:pPr/w:pStyle[#w:val='berschrift1']][1]"/>
and then use this variable in a template rule:
<xsl:template match="w:p[. intersect $special]"/>
In XSLT 3.0 you can reduce this to
<xsl:template match="$special"/>