>>>>> "Ganesh" == Ganesh Babu N <nbabuganesh@xxxxxxxxx> writes:

    Ganesh> <xsl:template match="processing-instruction()">
    Ganesh> <xsl:for-each select="processing-instruction()/name()">
    Ganesh> <xsl:if test="@id !=
    Ganesh> following-sibling::processing-instruction()/@id"/>
    Ganesh> <xsl:message>following-sibling::processing-instruction()/@id
    Ganesh> is out of sequence</xsl:message> </xsl:if> </xsl:for-each>
    Ganesh> <xsl:template>

    Ganesh> When i compile this sheet with saxon9b, it is showing
    Ganesh> error as processing-instruction can not select anything.

That's because processing instructions may not contain processing
instruction children.

Remove the for-each (you only match on one processing instruction at a
time) for starters.
-- 
Colin Adams
Preston Lancashire