Description:
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Wrong handling <xsl:include> and <xsl:import> elements with href attribute with relative to main-stylesheet path in domxml_xslt_stylesheet->process. 
Got Error Warning: domxml_xslt_stylesheet(): compilation error: element include in D:\inet\wwwroot\index.php on line 44

Warning: domxml_xslt_stylesheet(): xsl:include : unable to load index/header.xslt in D:\inet\wwwroot\index.php on line 44
error!



Reproduce code:
---------------
php:

$xml = some valid xml;
$xslt = domxml_xslt_stylesheet($stylesheetstring);
$result = $xslt->process($xml);

xslt:

<xsl:include href="main/header.xslt"/>
<xsl:call-template name="header"/><!-- in main header.xslt-->


Expected result:
----------------
When When <xsl:include href="/inet/wwwroot/stylesheets/main/header.xslt"/> $xslt->process($xml) works fine. But if
<xsl:include href="main/header.xslt"/> or <xsl:include href="stylesheets/main/header.xslt"/> got warning with no result FALSE.

Directory structure something like 
d:\inet\wwwroot\index.php
d:\inet\wwwroot\stylesheets\main.xslt
d:\inet\wwwroot\stylesheets\main\header.xslt