help! can't get attribute mix-in to work

I'm trying to mix in smil animation attributes using
anyAttribute processContents=strict on an HTML P element,
but I'm losing; this looks right:

Validation warning: in unnamed entity at line 15 char 1 of
http://slow1.w3.org/XML/2000/04schema-hacking/h+s.html:
allowing {http://www.w3.org/2000/TR/smil-animation10}:begin because it
matched wildcard(##other)

but I don't see why it's not finding my declaration of t:begin:

Validation error: in unnamed entity at line 15 char 1 of
http://slow1.w3.org/XML/2000/04schema-hacking/h+s.html:
 can't find a type for wildcard-matching attribute
{http://www.w3.org/2000/TR/smil-animation10}:begin

document:
	http://slow1.w3.org/XML/2000/04schema-hacking/h+s.html
	(aka http://www.w3.org/XML/2000/04schema-hacking/h+s.html
	except for mirroring glitches)

html schema:
	http://slow1.w3.org/XML/2000/04schema-hacking/html.xsd

smil animation schema:
	http://slow1.w3.org/XML/2000/04schema-hacking/smil-animation.xsd

validation results:
http://cgi.w3.org/cgi-bin/xmlschema-check?docAddrs=http%3A%2F%2Fslow1.w3.org%2FXML%2F2000%2F04schema-hacking%2Fh%2Bs.html



-- 
Dan Connolly, W3C http://www.w3.org/People/Connolly/