fragment transformations

Hi all,


I have mozilla transforming a fragment obtained by  
range.createContextualFragment() to some target format. It all works  
very nice. Great! But only when I use lower case tag names in my xslt  
selectors. I'm happy with that it works but wonder why..

Given a html tag soup that after being parsed serializes to a well- 
formed something in null namespace with all upper case html tags: why  
does the xslt transformer match lower case tag equivalents only?

1. var str = "<p>a paragraph<p>next paragraph"
2. var fg = range.createContextualFragment(str)
3. serializeToString(fg) -> <P>a paragraph</P><P></P>
4. xsl:template match="P" -> no match, xsl:template match="p" -> match

Is this stuff documented somewhere? Or may I simply miss the point?

Best regards
Thomas