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In XSLT, you can iterate a for-each loop based on the condition stored in a variable using the "select" attribute of the for-each loop.

For example, let's say you have a variable named "condition" that contains the XPath expression that you want to use as the condition for the loop. You can use this variable in the for-each loop like this:

<xsl:variable name="condition" select="/path/to/condition"/>

<xsl:for-each select="node()"> <xsl:if test="$condition"> </xsl:if> </xsl:for-each>

In this example, we are using the "select" attribute of the for-each loop to iterate through all child nodes of the current node. Then, we are using an if statement to check if the condition stored in the "condition" variable is true. If it is true, we can perform some action for each node that meets the condition.

Note that the "select" attribute of the for-each loop can also be used to specify the nodes that should be iterated over based on a condition. For example:

<xsl:for-each select="node()[contains(@class, 'myclass')]"> </xsl:for-each>