The type OclVoid is a type that conforms to all other types except OclInvalid.
				It has one single instance, identified as 
				null, that corresponds with the UML LiteralNull value specification.
				Any property call applied on 
				null results in 
				invalid, except for the
				oclIsUndefined(), oclIsInvalid(), =(OclAny) and <>(OclAny) operations.
				However, by virtue of the implicit conversion to a collection literal,
				an expression evaluating to 
				null can be used as source of collection operations (such as ‘isEmpty’).
				If the source is the 
				null literal, it is implicitly converted to Bag{}.
			
OclVoid is itself an instance of the metatype VoidType.
conformsTo 
				
					OclAny
				
			
Operations
				
=(object2 : OclSelf[?]) : Boolean[1]
				precedence: 
				EQUALITY
			
Redefines the OclAny operation, returning 
				true if object is 
				null, 
				invalid
				if object is 
				invalid, 
				false otherwise.
			
				
<>(object2 : OclSelf[?]) : Boolean[1]
				precedence: 
				EQUALITY
			
				
allInstances() : Set(OclSelf[*|?])
			
Returns 
				Set{null}.
			
				
and(b : Boolean[?]) : Boolean[?]
				precedence: 
				AND
			
				
implies(b : Boolean[?]) : Boolean[?]
				precedence: 
				IMPLIES
			
				
oclAsSet() : Set(OclSelf)
			
				
oclIsInvalid() : Boolean[1] validating
			
				
oclIsUndefined() : Boolean[1] validating
			
				
or(b : Boolean[?]) : Boolean[?]
				precedence: 
				OR
			
				
toString() : String[1]
			
Returns 
				null.