xsl:value-of constructs a text node, the value of the select expression is
atomized and converted to a string. By the time the xsl:element instruction
is evaluated, there is no remaining knowledge that the value of this text
node started life as an integer. The type annotation on the element will
therefore be "untyped". In fact, with a non-schema-aware XSLT processor, all
elements are annotated as "untyped".
With a schema-aware processor, you can annotate the element as an integer by
using the validation or type attributes on xsl:element, for example you can
say
<xsl:element name="a" type="xs:integer">
However, even then you need to be careful because your xsl:variable is
constructing an untyped document, and the type annotation on the element
will therefore be lost before you refer to it. What you want is:
<xsl:variable name="var" as="element(*, xs:integer)">
<xsl:element name="a" type="xs:integer">12</xsl:element>
</xsl:variable>
<xsl:if test="data($a) instance of xs:integer">... true
<xsl:if test="$a instance of element(*, xs:integer)">... true
Michael Kay
http://www.saxonica.com
-----Original Message-----
From: Kenneth Stephen
[mailto:marvin(_dot_)the(_dot_)cynical(_dot_)robot(_at_)gmail(_dot_)com]
Sent: 11 October 2004 19:01
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Subject: [xsl] Checking for instance of xs:integer
Hi,
I have the following code :
<?xml version="1.0"?>
<xsl:stylesheet version="2.0"
xmlns:xs="http://www.w3.org/2001/XMLSchema";
xmlns:xdt="http://www.w3.org/2003/11/xpath-datatypes";
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
<xsl:output omit-xml-declaration="yes" />
<xsl:template match="/">
<xsl:variable name="var">
<xsl:element name="a">
<xsl:value-of select="xs:integer(2)
treat as xs:integer" />
</xsl:element>
</xsl:variable>
<xsl:choose>
<xsl:when test="$var/a instance of
xs:integer">
yes
</xsl:when>
<xsl:otherwise>
no
</xsl:otherwise>
</xsl:choose>
</xsl:template>
</xsl:stylesheet>
...where I'm trying to detect if a variable has an integer value. The
output that I currently get is :
bash-2.05b$ java net.sf.saxon.Transform intck.xsl intck.xsl
no
At first I thought that this is because the xsl:value-of that is
used to assign the value of $var/a was producing either a string or an
untypedAtomic value. However, changing the "xsl:when" to test for
xs:string and xsd:untypedAtomic didnt work either. Is there any way to
get this to work without using a schema aware processor?
Thanks,
Kenneth
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