apply-imports clarification needed

I found a good explanation on the archive, Thanks again Jeni!
http://www.biglist.com/lists/xsl-list/archives/200202/msg00727.html

Which i understand is a good way of adding layers to the final output:

	<layer providedby="importer">
		<layer providedby="imported" via="apply-imports">
		</
	</

So am i correct in assuming that apply-templates will only allow me to
"wrap" the results of an imported template, rather than modifying the RTF
itself?  Ideally i'm trying to add an attribute to the root of the imported
templates output, rather that wrapping it up in yet another layer...

	<layer providedby="imported" via="apply-imports"
newAttr="providedBy(importer)"/>

I can't do that can i?



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