This abstract element defines an equivalence class over the elements which occur freely at the top level of schemas. These are: datatype, type, element, attributeGroup, group, notation All of their types are based on the "annotated" type by extension. element @name complexType @name group @name attributeGroup @name notation @name simpleType @name .//key|.//unique @name .//key|.//unique|.//keyref @name .//keyref @name Will be restricted to required or forbidden This was for the top-level type element, daughter of <schema Required at the top level This was for the nested type element, daughter of <element Forbidden when nested A utility type, not for public use #all or (possibly empty) subset of {equivClass, extension, list, restriction, reproduction} A utility type, not for public use Should be a sequence drawn from the values of derivationChoice plus 'equivClass' and 'list' or #all -- regexp is only an approximation #all or (possibly empty) subset of {extension, restriction, reproduction} A utility type, not for public use Should be a sequence drawn from the values of derivationChoice, or #all -- regexp is only an approximation ##any | ##other | ##local | list of {uri, ##targetNamespace} A utility type, not for public use An XPath expression A utility type, not for public use A VERY permissive definition, probably not even right A public identifier, per ISO 8879 A utility type, not for public use