importStylesheet errors

If I load a xsl stylesheet like 
$dom->load('myStyleSheet.xsl');

if that style sheet uses and <xsl:include href="URI"/>
and then try to import use
$result= $proc->importStylesheet($dom);

I get errors such as
Opening and ending tag mismatch: xsl:stylesheet line 1 and xsl:template

Is there a way around this?

Kind regards
Kevin


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Kevin Waterson
Port Macquarie, Australia