[Wolves] sematic web checkers

[sparkes]

My new webpages are valid XHTML, CSS2, and get AAA for accessability
(IMHO) but does anyone know of a source of online semantic checking?

I am not looking for something to suggest RDF for the page cos that
would be going a little too far, just something that says, yes this
looks like a readable document to me.

you know check that my paragraphs and headings make sense to a machine
;-)

sparkes