The interface represents the namespace schema information information item.
Each namespace schema information information item corresponds to an XML
Schema with a unique namespace name.
[schema components]: a list of top-level components, i.e. element
declarations, attribute declarations, etc.
param
objectType The type of the declaration, i.e.
ELEMENT_DECLARATION. Note that
XSTypeDefinition.SIMPLE_TYPE and
XSTypeDefinition.COMPLEX_TYPE can also be used as the
objectType to retrieve only complex types or simple
types, instead of all types.
return
A list of top-level definition of the specified type in
objectType or an empty XSNamedMap if no
such definitions exist.