Hi,
I have a 1.0 stylesheet that takes a WXS schema and adds xml:base to certain
complex type definitions. The rule for inclusion of the attribute is that
the complex type must either include directly, or have a descendent in
another complex type that includes the XLink namespace.
So the stylesheet recurses through each complex type and tests to see if
they contain anything belonging to the XLink namespace. If the type is
itself a complex type the template is called again to check to see if that
one has any elements within the XLink namespace, and so on. If the XLink
namespace is found then <xsd:attribute ref="xml:base"/> is output.
My problem is that once the XLink namespace is found I would like the
recursion to stop, mainly because if the namespace is found in more than one
descendent element/attribute declaration the attribute is added multiple
times.
I suspect that either my approach is totally wrong, or this is a common
enough problem that there is a design pattern I can use to achieve the
effect I want, but I haven't hit on the key words to find it. So any
pointers would be gratefully received.
This is the template causing the problem:
<xsl:template match="xsd:element" mode="findXLink">
<xsl:choose>
<!-- if the element is declared locally (has a type attribute_ -->
<xsl:when test="@type">
<!-- remove the namespace prefix from the qname -->
<xsl:variable name="myType" select="substring-after(@type, ':')"/>
<xsl:for-each select="/xsd:schema/xsd:complexType[(_at_)name =
$myType]">
<xsl:choose>
<!-- if the complex type definition includes anything in the XLink
namespace output the xml:base attribute -->
<xsl:when test=".//@namespace='http://www.w3.org/1999/xlink'">
<xsd:attribute ref="xml:base"/>
</xsl:when>
<!-- otherwise apply this template to all of the elements declared
within the complex type -->
<xsl:otherwise>
<xsl:apply-templates select=".//xsd:element" mode="findXLink"/>
</xsl:otherwise>
</xsl:choose>
</xsl:for-each>
</xsl:when>
<!-- otherwise assume that the element references a globally declared
element, so look for that -->
<xsl:otherwise>
<xsl:variable name="myName" select="substring-after(@ref, ':')"/>
<xsl:apply-templates select="//xsd:element[(_at_)name = $myName]"
mode="findXLink"/>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
All the best
Mark
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