Variable Scope
An <xsl:variable> element is scoped to
the element that contains it. If an <xsl:variable> element is a top-level
element (its parent is <xsl:stylesheet>), it is global, and
its value is visible everywhere in the stylesheet. You can also use an
<xsl:variable> element within
an <xsl:template> to override
the value of a global variable locally.
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