This type is extended by component types to allow them to be documented.
This type is extended by component types to allow
attributes from other namespaces to be added.
Please refer to the WSDL 2.0 specification for
additional constraints on the contents of this type.
This abstract type is intended to serve as the base type for
extensibility elements. It includes the wsdl:required attribute
which it is anticipated will be used by most extension elements