ncn	in	NameCharacterName
null	in	NullName
p	in	Prefix	::=	NameCharacterName + NullName
wn	in	WildName
l	in	LocalPart	::=	NameCharacterName + NullName
uri	in	UniformResourceIdentifier
nsn	in	NamespaceName	::=	UniformResourceIdentifier + NullName
qn	in	QualifiedName	::=	( Prefix X LocalPart )
un	in	UniversalName	::=	( Namespace X LocalPart X Prefix )
ns	in	Namespace	::=	( NamespaceName X ( LocalPart => UniversalName ) )
n	in	Name	::=	( UniversalName + QualifiedName )
nsb	in	NamespaceBinding	::=	( Prefix X Namespace )
nse	in	NamespaceEnvironment	::=	( Prefix => (Namespace + Null) )
a	in	Attribute	::=	Name
e	in	Element	::=	( Name X NamespaceBinding* X Attribute* X Element* )
em	in	ElementModel		( Name* + WildName )
ed	in	ElementDeclaration	::=	( Name X ElementModel X Name* X NamespaceEnvironment)
s	in	Schema	::=	ElementDeclaration*
doc	in	Document	::=	( Name X Schema X Element )