some thing strange in Xalan extension with javascript

[cyfer zhang <cy...@hotmail.com>]

hello every body.
I met some thing strange when I am trying to extend Xalan with Javascript. 
And I am asking why?
And the code is below
*************************************************************
<?xml version="1.0" encoding="GB2312"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
version="1.0"
	xmlns:lxslt="http://xml.apache.org/xslt"	xmlns:my-ext="ext1"
	extension-element-prefixes="my-ext"><xsl:output encoding="GB2312"/>
<lxslt:component prefix="my-ext" elements="out" functions="displaySex">
	<lxslt:script lang="javascript">	function out(xslProcessorContext, elem){
		var o = elem.getChildNodes();
		var oTransformer = xslProcessorContext.getTransformer();			try{
			for(var i = 0 ; i &lt; o.getLength() ; i ++ ){
				o.item(i).execute( oTransformer );			}		}catch( e ){			return e;		}
		return ",吃了吗？";	}

function displaySex( sex ){
		var sexStr = new String(sex.item(0).getNodeValue());
		if( "m" == sexStr ) return "先生";		else if( "f" ==sexStr ) return "女士";
		else return new String(sex.item(0).getNodeValue());	}    	</lxslt:script>
</lxslt:component>
<xsl:template match="person">
    <result>
        <my-ext:out>
             <xsl:value-of select="."/>
             <xsl:value-of select="my-ext:displaySex(@sex) 
"/>你好</my-ext:out>
    </result>
</xsl:template>
</xsl:stylesheet>
************************************************************
I called function displaySex in this way, <xsl:value-of 
select="my-ext:displaySex(@sex) "/>, and I think the argument @sex should be 
a string. However it turn out to be a DTM object equivelant to NodeList. I 
am not sure why. And whem I implement the same funtion in Java, the argument 
called in the same way is a String. And the java code is below.
**************************************************************
package a;import org.apache.xalan.extensions.XSLProcessorContext;
import org.apache.xalan.templates.ElemExtensionCall;
import org.apache.xalan.templates.ElemTemplateElement;public class A{
	public String out( XSLProcessorContext xslProcContext , ElemExtensionCall 
elmExtCall){
		org.apache.xalan.transformer.TransformerImpl oTrsfImpl =
			xslProcContext.getTransformer();
		org.w3c.dom.NodeList oList = elmExtCall.getChildNodes();		try{
			for( int i = 0 ; i < oList.getLength() ; i ++ ){
				((ElemTemplateElement)oList.item(i)).execute(oTrsfImpl);			}
		}catch(Exception e){			e.printStackTrace();		}				return ",吃了吗？";	}
	public String displaySex( String strSex){
		if( strSex.equals("m") ) return "先生";
		else if( strSex.equals("f") ) return "女士";		else return strSex;	}	}
*******************************************************************
And the xsl document that call the java code below
******************************************************************
<?xml version="1.0" encoding="GB2312"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
version="1.0"
	xmlns:lxslt="http://xml.apache.org/xslt"	xmlns:my-ext="ext1"
	extension-element-prefixes="my-ext"><xsl:output encoding="GB2312"/>
<lxslt:component prefix="my-ext" elements="out" functions="displaySex">
	<lxslt:script lang="javaclass" src="xalan://a.A">	    	</lxslt:script>
</lxslt:component><xsl:template match="person">
<results><my-ext:out><xsl:value-of select="."/><xsl:value-of 
select="my-ext:displaySex(@sex)"/>你好</my-ext:out></results>
</xsl:template></xsl:stylesheet>
**********************************************************

And my question is why there are such difference between Javascript and 
Java?

Cyfer(Zhang, Xin)

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