<import ... /> Question

I have an XML schema question that someone on this list hopefully
can answer:

If an XML schema foo.xsd imports another XLM schema bla.xsd, which
in turn imports the first XML schema foo.xsd, is it permitted?

I couldn't find any conclusive statement in the documents - it may
be there, I just didn't see it.  Pointers would be appreciated.

Regards,

Andreas