WSDL import questions

Anyone able to shed some light on the wsdl import statement as described in
http://www.w3.org/TR/2001/NOTE-wsdl-20010315
<http://www.w3.org/TR/2001/NOTE-wsdl-20010315>  ?
 
In section 2.1.2 example 2 the import statement within file
"stockquote.wsdl" appears to import a <schema> element (in "stockquote.xsd")
as the direct child of a <definitions>, whereas the WSDL grammar mandates
that the <schema> element should be contained within a <types> element...
 
Further on the import statement within file "stockquoteservice.wsdl" appears
to import a <definitions> element as the direct child of an enclosing
<definitions> - again this appears to be contrary to the grammar as laid out
in 2.1.
 
Is there some implied rules associated with a import statement (e.g. if the
importee is a schema an enclosing <types> element may be inferred). If so
maybe the authors could make the rules clear in the next rev. of the spec.
 
Or maybe its just that I'm missing something :-(
 
        Simon