possible problem in SimpleNodeLocator::locationPathPattern

Xalan get wrong result for following input files:
XML:
<?xml version="1.0"?>
<sss>
<sss><i>XML</i></sss>
</sss>

XSLT:
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<xsl:template match="/">
<xsl:apply-templates select="/sss/*" mode="b"/>
</xsl:template>

<xsl:template match="/sss//*" mode="b">
<xsl:apply-templates select="i" mode="b"/>
</xsl:template>

</xsl:stylesheet>

The XSLT result of Xalan:
<?xml version="1.0" encoding="UTF-8"?>
XML

"XML" should not appear, it seems that there is something wrong in the algorithm
of SimpleNodeLocator::locationPathPattern(stepPattern and nodeTest). When
/sss/sss/i is selected, <xsl:template match="/sss//*" mode="b"> is not applied,
Xalan choose the default rule instead.

If I change the source file to:
<?xml version="1.0"?>
<sss>
<ss><i>XML</i></ss>
</sss>

Then "XML" will not appear. Both the Xalan-C(1.0 and 1.1) and Xalan-j have the
problem, Saxon can handle it correctly.