XSLT, 2nd Edition

Name

[2.0] type-available()

Given the name of a datatype, returns true if that datatype is known to the XSLT processor.

Syntax

xs:boolean type-available($typeName as xs:string)

Input

An xs:string containing the name of a datatype.

Output

The xs:boolean value true if the datatype is known to the XSLT processor; false otherwise.

Defined in

XSLT 2.0 section 18.1.4, “Testing Availability of Types.”

Example

Here’s a short stylesheet that checks the availability of two datatypes. The first datatype is defined to all XSLT 2.0 processors, while the second datatype is defined in a schema and therefore requires a schema-aware processor.

<?xml version="1.0"?>
<!-- type-available.xsl -->
<xsl:stylesheet version="2.0"
  xmlns:xs="http://www.w3.org/2001/XMLSchema"
  xmlns:age="http://www.oreilly.com/xslt"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  
  <xsl:output method="text"/>

  <xsl:template match="/">
    <xsl:text>&#xA;A test of the type-available() function:&#xA;</xsl:text>
    <xsl:text>&#xA;    xs:integer is available:  </xsl:text>
    <xsl:value-of select="type-available('xs:integer')"/>
    <xsl:text>&#xA;    age:age-type is available:  </xsl:text>
    <xsl:value-of select="type-available('age:age-type')"/>
  </xsl:template>
  
</xsl:stylesheet>

Notice that we have to declare the namespace prefixes for the datatypes. Because there is no <xsl:import-schema> element, only the first datatype is available:

A test of the type-available() function:

    xs:integer is available:  true
    age:age-type is available:  false

If we import a schema into ...