The Microsoft XML parser doesn't like this syntax for checking two different elements before entering an if or when section. Is there a right way to do this, and if so, what is it?

< xsl:choose >
< xsl:when test="ISFIRSTNOTE[.='Y'] and USEBASELIN[.='N']" >
blah blah blah
< /xsl:when >
< /xsl:choose >