>>>>> "Arul" == Arulraj  <p_arulraj@xxxxxxxxx> writes:

    Arul> sorry, this String value comes from the another XML file.
    Arul> <xsl:variable name="searchAttribute"><xsl:value-of
    Arul> select="$FormatTmp/OODesign/format/@value"/></xsl:variable>


OK.
Provided the xsl:variable declaration is at the top-level of the
(presumed) xsl:stylesheet/xsl:transform, then you simply xsl:include
the file into your main xsl:stylesheet/xsl:transform.
Global variables declared in any stylesheet module are available to
all stylesheet modules.
-- 
Colin Adams
Preston Lancashire