[xsl] Difference between saxon transform.exe and net.sf.saxon.Transform

I've spent some time trying to get a custom collation to work on an
indigenous language using Saxon. I eventually figured out how to do it
but am still a little perplexed. I have not programmed in java before
but was able to copy and adapt some java code to create a class that
extends the RuleBasedCollator (refer to:
http://www.ibm.com/developerworks/library/x-xsltsorting/ and
http://java.sun.com/javase/6/docs/api/java/text/RuleBasedCollator.html)

Could someone explain to me why this works:

java net.sf.saxon.Transform -o testout.xml "LIFTExport.xml"
"LIFTCustomCollated.xsl"

but this does not:
Transform.exe -s:"LIFTExport.xml" -xsl:"LIFTCustomCollated.xsl" -o:testout.xml

with the following stylesheet (of particular interest the xsl:sort collation):

<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
    <xsl:output method="xml"/>
    <xsl:template match="/">
        <xsl:apply-templates/>
    </xsl:template>

    <xsl:template match="lift">
        <lift>
            <xsl:apply-templates mode="copy" select="@*"/>
            <xsl:apply-templates select="header"/>
            <xsl:apply-templates select="entry">
                <xsl:sort select="lexical-unit/form[(_at_)lang='tsi']/text"
order="ascending"

collation="http://saxon.sf.net/collation?class=com.lhtrees.xslt.LangXCollation;";
                />
            </xsl:apply-templates>
        </lift>
    </xsl:template>
    <xsl:template match="header">
        <header>
            <xsl:apply-templates mode="copy"/>
        </header>
    </xsl:template>

    <xsl:template match="entry">
        <entry>
            <xsl:apply-templates mode="copy"/>
        </entry>
    </xsl:template>
    <!-- Deep copy template -->
    <xsl:template match="*|text()|@*" mode="copy">
        <xsl:copy>
            <xsl:apply-templates mode="copy" select="@*"/>
            <xsl:apply-templates mode="copy"/>
        </xsl:copy>
    </xsl:template>
    <!-- Handle default matching -->
    <xsl:template match="*"/>
</xsl:stylesheet>

I am using saxon9. When I use the Transform.exe command line I get the
following error:

Warning: Failed to load com.lhtrees.xslt.LangXCollation
Warning: Failed to load com.lhtrees.xslt.LangXCollation
Error at xsl:sort on line 23 column 91 of liftCustomCollated.xsl:
  XTDE1035: Collation
http://saxon.sf.net/collation?class=com.lhtrees.xslt.LangXCollation;
  has not been defined
Failed to compile stylesheet. 1 error detected.

I'm glad it works with java net.sf.saxon.Transform but would like to
understand the difference.

Thank you for any enlightenment you can give.

Larry

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