Only valid with a stylsheet specifying the xsl namespace, http://www.w3.org/TR/WD-xsl. Stylesheets using the XSLT namespace, http://www.w3c.org/1999/XSL/Transform, cannot use this element.
Evaluates a script expression to generate a text string.
Syntax
<xsl:eval
language="language-name" >
</xsl:eval>
Attributes
language
Active Scripting language used for the expression contained within this element. If left unspecified, the current scripting language is used, as specified by a language attribute on an ancestor. If no such attribute exists, JScript® (compatible with ECMA 262 language specification) is used. This attribute accepts the same values as the language attribute on the HTML SCRIPT element.
Element Information
| Number of occurrences | Unlimited |
| Parent elements | xsl:attribute, xsl:comment, xsl:copy, xsl:element, xsl:for-each, xsl:if, xsl:otherwise, xsl:pi, xsl:template, xsl:when, output elements |
| Child elements | (No child elements) |
| Requires closing tag | Yes. XSL is an XML grammar and, like all XML grammars, all tags must have closing tags to satisfy the definition of well-formed. |
Remarks
The contents of this element are treated as an expression. Alternatively, this element can also contain a sequence of script statements. The value returned by the script is converted to a string.
The reserved characters <, >, and & are escaped using the character entities <, >, and & respectively.
Other than at the text level, xsl:eval does not provide a mechanism for affecting structural transformation. See the expr attribute on xsl:if and xsl:when.
Example
The following fragment demonstrates a call to a user-defined routine, Celsius.
<xsl:stylesheet language="VBScript" xmlns:xsl="http://www.w3.org/TR/WD-xsl">
<xsl:template match="/">
<xsl:eval>Celsius(32)</xsl:eval>
</xsl:template>
<xsl:script language="VBScript">
Function Celsius(fDegrees)
Celsius = (fDegrees - 32) * 5 / 9
End Function
</xsl:script>
</xsl:stylesheet>
See Also