xs:notation
<xs:notation id = "ID
" name = "NCName
" public = "PUBLIC identifier
" system = "anyURI
" > <!-- (xs:annotation?) --> </xs:notation>
The top-level xs:notation
element defines a notation. It's the schema
equivalent of a <!NOTATION>
declaration in a DTD.
Each notation has a name, a public ID, and a system ID identified
by the relevant attribute on this element.