The OrderedCollection type provides the shared functionality of the OrderedSet and Sequence collections for which the elements are ordered. The common supertype of OrderedCollection is Collection.
conformsTo 
				
					Collection(T)
				
			
Operations
				
at(index : Integer[?]) : T[?] invalidating
			
The i-th element of ordered collection.
				
first() : T[?] invalidating
			
The first element in 
				self.
			
				
indexOf(obj : OclAny[?]) : Integer[1] invalidating
			
The index of object obj in the ordered collection.
				
last() : T[?] invalidating
			
The last element in 
				self.