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Unexpected failure of xsl:attribute
Added by Anonymous almost 18 years ago
Legacy ID: #4083182
Legacy Poster: Joseph Thomas-Kerr (jak09)
Hi, Can someone please explain to me what on earth is going on in the following? I
am receiving the error "An attribute node (optional) cannot be created after
the children of the containing element" when trying to process the following
stylesheet with saxon 8.8 or saxon 6.5.5. It occurs both when debugging the stylesheet
in oxygen 8, and when running it from the commandline with saxon 8.8. Uncommenting the
empty template for @* fixes the problem and my stylesheet works fine. I can pause it in
oxygen and look at the value of $eltList and it is as expected. What is going on here?
Joe. test stylesheet: <xsl:stylesheet
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:math="http://exslt.org/math"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
version="1.0"> <xsl:template
match="xsd:schema/xsd:element[1]/xsd:complexType/xsd:sequence">
<xsl:variable name="eltList">
<xsl:apply-templates mode="eltList"/>
</xsl:variable> <ala> <xsl:apply-templates
mode="actions" select="$eltList"/>
</ala> </xsl:template> <xsl:template
match="xsd:element" mode="eltList">
<read> <xsl:apply-templates select="@"
mode="eltList"/> </read>
</xsl:template> <xsl:template match="@minOccurs"
mode="eltList"> <xsl:attribute
name="optional">bar</xsl:attribute>
</xsl:template> <!--<xsl:template
mode="eltList" match="@"/>-->
</xsl:stylesheet> test input: <xsd:schema
targetNamespace="a" xmlns="a"
xmlns:test="a"
xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<xsd:element name="root">
<xsd:complexType> <xsd:sequence> <xsd:element
name="optionalElement" type="test:b1"
minOccurs="0"/> <xsd:element
name="multipleElement" type="test:b2" />
</xsd:sequence> </xsd:complexType>
</xsd:element> </xsd:schema>
Legacy ID: #4083634
Legacy Poster: Michael Kay (mhkay)
The default template for attributes is in effect <xsl:template
match="@"> <xsl:value-of
select="."/> </xsl:template> This creates a text
node (which isn't very useful or intuitive). This means that with your template
commented out, you are doing: <read> <xsl:apply-templates
select="@"/> </read> <xsl:template
match="@*"> <xsl:value-of
select="."/> </xsl:template> <xsl:template
match="@minOccurs"> <xsl:attribute
name="optional">bar</xsl:attribute>
</xsl:template> So you are processing all the attributes of the current
element, in an unpredictable order, and for some of them you create text nodes, while
for another you create an attribute node. This makes it highly likely that the attribute
node will be preceded by a text node, which accounts for the error you are seeing.
Michael Kay
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