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Evaluates an expression, initialises a named variable if it does not exist, then assigns the result of the evaluation to the variable.
variable:Set( name, expression )
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Both name and expression are required. Expression may be a constant, a function (Example 1), or an XPath expression (Example 2).
A variable is created with name name if such a variable does not exist. The result of evaluating expression is assigned to the variable, overwriting any existing value of the variable.
Example 1
This example creates the variable "envxml" and sets it to the contents of the "env.xml" file.
<pc:evaluate select="variable:Set('envxml', files:XmlFile('env.xml'))"/>
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Example 2
This example created the variable "mytableregexp" and sets it to the text contents of the <result> element in the outcome of an XSLT transformation executed by a <pc:apply> child node instruction. This outcome is a regular expression representing a list of tables, of the format
(TABLE1|TABLE2|...)
select uscsxsl.blend(
'<example xmlns:pc="Processing.Command" pc:hideme="true">
<pc:assign sql = "SELECT TO_CLOB(( INVOKE XML.EXPORT WITH SELECT * FROM T_TABLE ))" />
<pc:assign xml = "{sql:SqlStmnt('''', $sql)}" />
<pc:evaluate select="variable:Set(''mytableregexp'', ./result/text())">
<pc:apply xml="{$xml}" xsl="{xsl:stylesheet}" >
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" encoding="UTF-8"/>
<xsl:template match="/">
<result>
<xsl:text>(</xsl:text>
<xsl:for-each select ="*/T_TABLE">
<xsl:value-of select="@TABLE_NAME"/>
<xsl:if test="position()<last()">
<xsl:text>|</xsl:text>
</xsl:if>
</xsl:for-each>
<xsl:text>)</xsl:text>
</result>
</xsl:template>
</xsl:stylesheet>
</pc:apply>
</pc:evaluate>
<pc:comment-of><pc:copy-of select="$mytableregexp"/></pc:comment-of>
</example>'
)
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See also
assign:variable
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