How saxon:attribute-order works? - xslt

Question

I'm trying to reorder the attributes of a tag using the Serialization parameter "saxon:attribute-order" but I could not make it works, what am I missing?
Source file:
<?xml version="1.0"?>
<list>
<span class="pagebreak" name="1" title="ONE">Test</span>
<span class="nobreak" name="X" title="X">Test</span>
<span class="pagebreak" name="2" title="TWO">Test</span>
<span class="pagebreak" name="3" title="THREE">Test</span>
<span class="pagebreak" name="4" title="FOUR">Test</span>
<span class="nobreak" name="Y" title="Y">Test</span>
<span class="pagebreak" name="5" title="FIVE">Test</span>
</list>
XSL:
<?xml version="1.0"?>
<xsl:stylesheet
version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:saxon="http://saxon.sf.net/"
exclude-result-prefixes="saxon">
<xsl:output method="xml" indent="yes" saxon:attribute-order="title name class * xml:space"/>
<xsl:template match="/">
<xsl:apply-templates select="*/span[contains(#class, 'pagebreak')]" />
</xsl:template>
<xsl:template match="*/span[contains(#class, 'pagebreak')]">
<xsl:copy-of select="." />
</xsl:template>
</xsl:stylesheet>
Output File:
<?xml version="1.0" encoding="UTF-8"?>
<span class="pagebreak" name="1" title="ONE">Test</span>
<span class="pagebreak" name="2" title="TWO">Test</span>
<span class="pagebreak" name="3" title="THREE">Test</span>
<span class="pagebreak" name="4" title="FOUR">Test</span>
<span class="pagebreak" name="5" title="FIVE">Test</span>

Answer 1

There's nothing wrong with the code you've shown us, so the problem is somewhere in what you haven't shown us...
Perhaps you're using Saxon-HE which doesn't recognise extension attributes.
Perhaps you're sending the output to a destination other than a serializer?
Try it from the command line, with the -t option, and see if that works, and then we can take it from there.