void function ( ASTNode arg0 , ASTNode arg1 , StructuralPropertyDescriptor arg2 ) { }
reports that the given node is about to lose a child . the first half of an event pair . the default implementation does nothing . concode_field_sep PlaceHolder placeHolder concode_field_sep void preReplaceChildEvent concode_elem_sep void postValueChangeEvent concode_elem_sep void postAddChildEvent concode_elem_sep void postCloneNodeEvent concode_elem_sep void preCloneNodeEvent concode_elem_sep void postRemoveChildEvent concode_elem_sep void postReplaceChildEvent concode_elem_sep void preAddChildEvent concode_elem_sep void preValueChangeEvent