+import org.eclipse.jdt.annotation.NonNull;
+import org.eclipse.jdt.annotation.Nullable;
+import org.opendaylight.yangtools.concepts.Immutable;
+import org.opendaylight.yangtools.yang.model.api.meta.DeclarationReference;
+import org.opendaylight.yangtools.yang.model.api.meta.StatementOrigin;