Subject: RE: [xsl] Checking for instance of xs:integer From: "Michael Kay" <mike@xxxxxxxxxxxx> Date: Tue, 12 Oct 2004 18:13:28 +0100 |
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.the.cynical.robot@xxxxxxxxx] > Sent: 11 October 2004 19:01 > To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx > 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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