<xsl:variable name="all-reqs"
select="document('requirements.xml')/requirements//requirement/number" />
<xsl:template match="/">
<un-assigned-reqs>
<xsl:for-each select="$all-reqs">
<xsl:choose>
<xsl:when test="/system/components/component/requirement/@number =
." />
That test can never be true.
If the top level element in requirements.xml is requirements, then the
path starting /system will select the empty node set.
/ at the start of an xpath means the root of the tree containing the
current node, and the current node here is an item in $all-reqs which
is a tree rooted in the node returned by the document() function.
I suspect you meant
<xsl:variable name="all-reqs"
select="document('requirements.xml')/requirements//requirement/number" />
<xsl:variable name="$root" select="/"/>
<xsl:template match="/">
<un-assigned-reqs>
<xsl:for-each select="$all-reqs">
<xsl:choose>
<xsl:when
test="$root/system/components/component/requirement/@number = ." />
although you dont need an xsl:choose with an empty branch it looks like
a single xpath is all you need
select="$all-reqs[not(.=$root/system/components/component/requirement/@number)]">
<requirement><xsl:value-of select="." /></requirement>
David
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