<<rule>> Create: Multiplicity-One Containment Reference
<<preserve>>
toContainedClass : EClass
<<preserve>>
toContainerClass : EClass
<<create>>
newContainmentReference : EReference
<<create>> upperBound = "1"
<<create>> containment = "true"
<<forbid, post>>
postContainerReference : EReference
<<create>>
eType
<<forbid, post>>
eOpposite
<<forbid, post>>
eOpposite
<<create>>
eContainingClass
eStructuralFeatures