XSLT 1.1: xsl:apply-transform

I would love to have a
	<xsl:apply-transform href="xpto.xsl" select="..." />
or
	<xsl:apply-stylesheet href="xpto.xsl" select="..." />
or a function
	transform('xpto.xsl', ...)

It would provide a simple way to compose and re-use
transformations, which I believe is quite a common
need (for me it is).

Regards,
Ricardo Amador