XML/XSLT stylesheet/instance of

instance of element()

File: Data.xml
<?xml version="1.0"?>
<addressbook>
  <address>
    <street>1234 Main Street</street>
    <city>Z</city>
    <state>WI</state>
    <zip>48392</zip>
  </address>
</addressbook>
File: Transform.xslt
<?xml version="1.0"?>
<xsl:stylesheet version="2.0" 
  xmlns:xs="http://www.w3.org/2001/XMLSchema"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:output method="text"/>
  <xsl:template match="/">
    <xsl:variable name="cities" as="item()*">
      <xsl:sequence select="addressbook/address/city"/>
      <xsl:sequence select="("A", "B", "C")"/>
      <xsl:sequence select="("D", "E", "F")"/>
    </xsl:variable>
    <xsl:text>Our customers live in these cities:&#xA;&#xA;</xsl:text>
    <xsl:for-each select="$cities">
      <xsl:choose>
        <xsl:when test=". instance of element()">
          <xsl:text>        Node: </xsl:text>
        </xsl:when>
        <xsl:otherwise>
          <xsl:text>Atomic value: </xsl:text>
        </xsl:otherwise>
      </xsl:choose>
      <xsl:value-of select="."/>
      <xsl:text>&#xA;</xsl:text>
    </xsl:for-each>
  </xsl:template>
</xsl:stylesheet>
Output:
Our customers live in these cities:
        Node: Z
Atomic value: A
Atomic value: B
Atomic value: C
Atomic value: D
Atomic value: E
Atomic value: F

Some tests of the "instance of" operator

File: Data.xml

File: Transform.xslt
<?xml version="1.0"?>
<xsl:stylesheet version="2.0" 
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xsl:output method="text"/>
  <xsl:template match="/">
    <xsl:text>&#xA;Some tests of the "instance of" operator:</xsl:text>
    <xsl:text>&#xA;&#xA;  "1995-04-21" instance of xs:date: </xsl:text>
    <xsl:value-of select=""1995-04-21" instance of xs:date"/>
    <xsl:text>&#xA;  xs:date("1995-04-21") instance of xs:date: </xsl:text>
    <xsl:value-of select="xs:date("1995-04-21") instance of xs:date"/>
    <xsl:text>&#xA;&#xA;  3 instance of xs:integer: </xsl:text>
    <xsl:value-of select="3 instance of xs:integer"/>
    <xsl:text>&#xA;  "3" instance of xs:integer: </xsl:text>
    <xsl:value-of select=""3" instance of xs:integer"/>
    <xsl:text>&#xA;  number("3") instance of xs:integer: </xsl:text>
    <xsl:value-of select="number("3") instance of xs:integer"/>
    <xsl:text>&#xA;  number("3") instance of xs:double: </xsl:text>
    <xsl:value-of select="number("3") instance of xs:double"/>
    <xsl:text>&#xA;  xs:integer("3") instance of xs:integer: </xsl:text>
    <xsl:value-of select="xs:integer("3") instance of xs:integer"/>
    <xsl:text>&#xA;  "3" cast as xs:integer instance of xs:integer: </xsl:text>
    <xsl:value-of select=""3" cast as xs:integer instance of xs:integer"/>
    <xsl:text>&#xA;  "e" instance of xs:integer: </xsl:text>
    <xsl:value-of select=""e" instance of xs:integer"/>
  </xsl:template>
</xsl:stylesheet>
Output:

Some tests of the "instance of" operator:
  "1995-04-21" instance of xs:date: false
  xs:date("1995-04-21") instance of xs:date: true
  3 instance of xs:integer: true
  "3" instance of xs:integer: false
  number("3") instance of xs:integer: false
  number("3") instance of xs:double: true
  xs:integer("3") instance of xs:integer: true
  "3" cast as xs:integer instance of xs:integer: true
  "e" instance of xs:integer: false