<xsl:for-each select="(xxxxxxx)[position() != 1]">
...
</xsl:for-each>
or in your case
<xsl:for-each select="(strData/mapping)[position() != 1]">
...
</xsl:for-each>
Michael Kay
http://www.saxonica.com/
Author, XSLT Programmer's Reference and XPath 2.0 Programmer's Reference