XSLTProcessor issue

I have located what appears to me to be bug in the XSLTProcessor in
PHP5.2.13 but want to insure that I am not overlooking something before
reporting it. Any advice will be appreciated.

The issue is apparent discrepancies in output sort order in an XSLTProcessor
generated list. Following is a detailed description.

Scenario: Disk resident xml file with a top level "Places" element and a
list of subordinate "Place" elements. Each "Place" element has a "fullName"
attribute with self explanatory value. Place heirarchy is indicated by comma
separated fields in the attribute value, e.g. Accomac Co., Virginia, USA.
Also, a disk resident xsl file whose purpose is to transform the xml file
into a html file with the "Place" element collection sorted and rewritten as
a list of full place names. When the xsl translation is invoked by assigning
the xsl to the xml file and accessing the xml file in IE8, the displayed
output appears exactly as expected, e.g.

Accomack Co., VA, USA
Adams Co., PA, USA
Ahoskie Twp., Hertford Co., NC, USA
Ahoskie, Hertford Co., NC, USA
AK, USA
AL, USA
Alachua Co., FL, USA
Alamance Co., NC, USA
Alameda Co., CA, USA
Alameda, Alameda Co., CA, USA

However, when invoked via the following php script, using PHP5.2.13 -

$xml = new DOMDocument();
$xml->load("F:\Places.xml");
$xsl = new DOMDocument();
$xsl->load("F:\Places.xsl");
$xslt = new XSLTProcessor();
$xslt->importStylesheet($xsl);
echo $xslt1->transformToXML($xml);

some sort order discrepancies appear in the output, e.g.

AK, USA
AL, USA
Accomack Co., VA, USA
Adams Co., PA, USA
Ahoskie Twp., Hertford Co., NC, USA
Ahoskie, Hertford Co., NC, USA
Alachua Co., FL, USA
Alamance Co., NC, USA
Alameda Co., CA, USA
Alameda, Alameda Co., CA, USA

Note that the state records, which have upper case second character,
incorrectly appear ahead of other places. This behavior appears even if the
"case-order='lower-first'" attribute is included in the element
in the xsl stylesheet.

Question: Is this a bug or am I overlooking something?



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