xsl:apply-imports and (imported) default templates

Hi,

We are using <xsl:apply-imports/> to allow an imported stylesheet to provide
custom javascript links in the head
of the generated html page.

The problem is that unless the imported stylesheet provides a do-nothing
template for this mode, the <xsl:apply-imports/>
directive seems to invoke the default templates from either the imported
stylesheet or itself.  I thought, from reading
the "manual", that xsl:apply-imports only invoked templates which have the
same mode as that of the invoking template.

Why are the default templates apparently being invoked?  Thank you.

Peter Rushforth