XML & XSL - xsl:when

Multiple conditional testing in conjunction with the xsl:otherwise and xsl:choose.

Syntax

<xsl:when expr="script-expression" language="language-name" test="pattern">

Attributes

• expr - script expression which evaluates to a Boolean. If the expression returns TRUE, and the test pattern succeeds, the contents of xsl:when are placed in the output. If one of these tests fails, the next xsl:when or xsl:otherwise in the xsl:choose block is tested.
• language - the scripting language used for the expression in the expr attribute. If left unspecified, the current scripting language is used, as specified by a language attribute on an ancestor. JScript is the default.
• test - XSL parse pattern.

Parent Elements

• xsl:choose

Child Elements

• xsl:apply-templates
• xsl:attribute
• xsl:choose
• xsl:comment
• xsl:copy
• xsl:element
• xsl:eval
• xsl:for-each
• xsl:if
• xsl:pi
• xsl:value-of

Purpose

One of the alternatives to be chosen by the xsl:choose. The alternative is xsl:otherwise element.

Use the xsl:if for simple conditional testing.

Global Population Extraction Example

Click here to view an example.