diff --git a/org.fortiss.tooling.kernel/trunk/src/org/fortiss/tooling/kernel/extension/base/.ratings b/org.fortiss.tooling.kernel/trunk/src/org/fortiss/tooling/kernel/extension/base/.ratings
index 5f40ddbfa04ee8d811b9ea9f2e12a7d6da9920cf..cec2e82057b59c0972379d5bc179d7871268ed8a 100644
--- a/org.fortiss.tooling.kernel/trunk/src/org/fortiss/tooling/kernel/extension/base/.ratings
+++ b/org.fortiss.tooling.kernel/trunk/src/org/fortiss/tooling/kernel/extension/base/.ratings
@@ -5,6 +5,5 @@ ElementCompositorBase.java 8667281b2e5988b11390cf77deab5d118f297ab1 GREEN
MultiViolationConstraintCheckerBase.java e2f17f02fae75a17e955d48734ed043323f26f04 GREEN
PrototypeProviderBase.java 62de3ea391ecb515883490517aa2e94ab812d91b GREEN
RemoveDeprecatedArtifactsMigrationProviderBase.java 48ded3c14cd7f3fe567c820eebf46c40214cf304 YELLOW
-RemoveUnknownFeatureMigrationProviderBase.java 0ffeb1f02a3f7476abcb467ebe07d3c5d5561b86 GREEN
TransformationContextChainBase.java b5195a9bde6d50268dda80fed993477d7a4447ee GREEN
TransformationProviderBase.java 0c3d114c6a3d854f74630417c05dd889ed02acdf GREEN
diff --git a/org.fortiss.tooling.kernel/trunk/src/org/fortiss/tooling/kernel/extension/base/RemoveUnknownFeatureMigrationProviderBase.java b/org.fortiss.tooling.kernel/trunk/src/org/fortiss/tooling/kernel/extension/base/RemoveUnknownFeatureMigrationProviderBase.java
deleted file mode 100644
index 177a231e5b84a515b4fcbe2fec679f032617019d..0000000000000000000000000000000000000000
--- a/org.fortiss.tooling.kernel/trunk/src/org/fortiss/tooling/kernel/extension/base/RemoveUnknownFeatureMigrationProviderBase.java
+++ /dev/null
@@ -1,133 +0,0 @@
-/*-------------------------------------------------------------------------+
-| Copyright 2015 fortiss GmbH |
-| |
-| Licensed under the Apache License, Version 2.0 (the "License"); |
-| you may not use this file except in compliance with the License. |
-| You may obtain a copy of the License at |
-| |
-| http://www.apache.org/licenses/LICENSE-2.0 |
-| |
-| Unless required by applicable law or agreed to in writing, software |
-| distributed under the License is distributed on an "AS IS" BASIS, |
-| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
-| See the License for the specific language governing permissions and |
-| limitations under the License. |
-+--------------------------------------------------------------------------*/
-package org.fortiss.tooling.kernel.extension.base;
-
-import java.util.ArrayList;
-import java.util.List;
-import java.util.Map;
-
-import org.eclipse.emf.ecore.EClass;
-import org.eclipse.emf.ecore.EObject;
-import org.eclipse.emf.ecore.EStructuralFeature;
-import org.eclipse.emf.ecore.util.FeatureMap;
-import org.eclipse.emf.ecore.xml.type.AnyType;
-import org.fortiss.tooling.kernel.extension.IMigrationProvider;
-import org.fortiss.tooling.kernel.extension.data.ITopLevelElement;
-
-/**
- * Base class for {@link IMigrationProvider}s to selectively remove unknown features from a model.
- *
- * @author barner
- */
-public abstract class RemoveUnknownFeatureMigrationProviderBase implements IMigrationProvider { // NO_UCD
- // Migrators are retired after a release, but this base class should be available when needed.
- // See https://af3-developer.fortiss.org/projects/autofocus3/wiki/Model_Migration
-
- /** Type of container previously owning the known unknown feature. */
- protected Class<?> containerType;
-
- /**
- * {@link EClass} representing how {@code anyType} references the unknown feature
- * (e.g., {@link org.eclipse.emf.ecore.EcorePackage.Literals#EREFERENCE} or
- * {@link org.eclipse.emf.ecore.EcorePackage.Literals#EATTRIBUTE}).
- */
- private EClass fieldType;
-
- /** Name of field of {@code anyType} that is used to reference the unknown feature. */
- private String fieldName;
-
- /** Class name of unknown feature to be removed. */
- private String className;
-
- /** Constructs a new {@link RemoveUnknownFeatureMigrationProviderBase}. */
- protected RemoveUnknownFeatureMigrationProviderBase(Class<?> containerType, EClass fieldType,
- final String fieldName, final String className) {
- this.containerType = containerType;
- this.fieldType = fieldType;
- this.fieldName = fieldName;
- this.className = className;
- }
-
- /** {@inheritDoc} */
- @Override
- public boolean needMigration(ITopLevelElement modelElement,
- Map<EObject, AnyType> unknownFeatures) {
-
- return doInternal(unknownFeatures, false);
- }
-
- /** {@inheritDoc} */
- @Override
- public void migrate(ITopLevelElement modelElement, Map<EObject, AnyType> unknownFeatures) {
- doInternal(unknownFeatures, true);
- }
-
- /**
- * Helper method to implement {@link #needMigration(ITopLevelElement, Map)} and
- * {@link #migrate(ITopLevelElement, Map)}.
- *
- * @param unknownFeatures
- * Set of unknown features to be investigated / manipulated
- *
- * @param migrate
- * If {@code true}, the respective unknown features are removed. Otherwise, the
- * return value indicates, if the migration is required.
- *
- * @return {@code true} iff there are unknown features that should be / have been removed.
- */
- private boolean doInternal(Map<EObject, AnyType> unknownFeatures, boolean migrate) {
- boolean rval = false;
- for(EObject object : unknownFeatures.keySet()) {
- if(containerType.isAssignableFrom(object.eClass().getInstanceClass())) {
- AnyType anyType = unknownFeatures.get(object);
- FeatureMap featureMap = anyType.getMixed();
- List<FeatureMap.Entry> toRemove = new ArrayList<FeatureMap.Entry>();
- for(FeatureMap.Entry feature : featureMap) {
- EStructuralFeature eStructuralFeature = feature.getEStructuralFeature();
- if(eStructuralFeature.eClass().equals(fieldType) &&
- eStructuralFeature.getName().equals(fieldName) &&
- getUnknownEClassName(feature).equals(className)) {
- if(migrate) {
- toRemove.add(feature);
- rval = true;
- } else {
- return true;
- }
- }
- }
- featureMap.removeAll(toRemove);
- }
- }
-
- return rval;
- }
-
- /**
- * Returns the name of an unknown {@link EClass} (i.e., that is not part of the meta-model (any
- * more)) represented by a given {@link org.eclipse.emf.ecore.util.FeatureMap.Entry}.
- *
- * In case the {@link EClass} is not represented by {@link AnyType} (e.g., because the
- * {@link EClass} is (still) part of the meta-model), {@code null} is returned.
- */
- private String getUnknownEClassName(FeatureMap.Entry feature) {
- if(feature.getValue() instanceof AnyType) {
- AnyType type = (AnyType)feature.getValue();
- return type.eClass().getName();
- }
-
- return null;
- }
-}