Strange Parsing Error - DTMLiaison

i'd appreciate any help debugging this error, using Xalan-Java 1.2.2:

org.xml.sax.SAXException: DTMLiaison can not handle nodes of type class
org.apache.xerces.dom.DeferredElementNSImpl
        at
org.apache.xalan.xpath.dtm.DTMLiaison.checkNode(DTMLiaison.java:161)
        at org.apache.xalan.xslt.StylesheetRoot.process(StylesheetRoot.java,
Compiled Code)
        ......

here are the conditions:
- i am using xalan-java 1.2
- opening server socket and accepting input stream of XML
- using precompiled XSL sheet (org.apache.xalan.xslt.StylesheetRoot) and
calling the process() method
- here is the XML, the parser gets past the processing instruction just
fine, but croaks on the <doc> element

<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="foo.xsl"?>
<doc>Hello</doc>

very simple XML but i am getting this strange error trying to transform it!

here is the XSL (straight from samples that come with Xalan):

<?xml version="1.0"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="1.0">
  <xsl:template match="doc">
    <out><xsl:value-of select="."/></out>
  </xsl:template>
</xsl:stylesheet>


thanks in advance



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