<<rule>> Delete: One-Way Reference [no opposite]
<<preserve>>
fromClassA : EClass
<<delete>>
oldRefB : EReference
<<preserve>>
fromClassB : EClass
<<forbid, pre>>
preRefA : EReference
<<delete>>
eType
<<forbid, pre>>
eOpposite
<<forbid, pre>>
eOpposite
<<delete>>
eContainingClass
eStructuralFeatures