diff --git a/README.md b/README.md
index 3483a4d0..18d2b3c4 100644
--- a/README.md
+++ b/README.md
@@ -113,6 +113,9 @@ Please ensure that your stack size is at least 1MB (for Saxon). Using the Oracle
 
 # News and noteworthy
 
+* v10.0.4 - work in progress
+    * Added new interface `IValidationExecutorSetMutable`
+    * Added new class `ValidationExecutorSetAlias`
 * v10.0.3 - 2024-12-01
     * Added default XML serialization of validation results
     * Added new `EValidationBaseType` entries
diff --git a/phive-api/src/main/java/com/helger/phive/api/executorset/IValidationExecutorSetMutable.java b/phive-api/src/main/java/com/helger/phive/api/executorset/IValidationExecutorSetMutable.java
new file mode 100644
index 00000000..963ee153
--- /dev/null
+++ b/phive-api/src/main/java/com/helger/phive/api/executorset/IValidationExecutorSetMutable.java
@@ -0,0 +1,54 @@
+package com.helger.phive.api.executorset;
+
+import javax.annotation.Nonnull;
+
+import com.helger.commons.annotation.ChangeNextMajorRelease;
+import com.helger.commons.state.EChange;
+import com.helger.phive.api.executor.IValidationExecutor;
+import com.helger.phive.api.source.IValidationSource;
+
+/**
+ * Define a common interface for {@link IValidationExecutorSet} with modifying
+ * methods.
+ *
+ * @author Philip Helger
+ * @param <SOURCETYPE>
+ *        The validation source type to be used.
+ * @since 10.0.4
+ */
+public interface IValidationExecutorSetMutable <SOURCETYPE extends IValidationSource> extends
+                                               IValidationExecutorSet <SOURCETYPE>
+{
+  /**
+   * Add a single executor.
+   *
+   * @param aExecutor
+   *        The executor to be added. May not be <code>null</code>.
+   * @return this for chaining
+   */
+  @Nonnull
+  IValidationExecutorSetMutable <SOURCETYPE> addExecutor (@Nonnull IValidationExecutor <SOURCETYPE> aExecutor);
+
+  /**
+   * Set the cache status to all contained validation executors, that implement
+   * the <code>IValidationExecutorCacheSupport</code> interface.
+   *
+   * @param bCache
+   *        <code>true</code> to enable caching, <code>false</code> to disable
+   *        it.
+   */
+  @ChangeNextMajorRelease ("Change return type to this type")
+  void setValidationExecutorDoCache (boolean bCache);
+
+  /**
+   * As some {@link IValidationExecutor} instances may contain a hard reference
+   * to a {@link ClassLoader} this methods removes all executors and allows for
+   * them to be garbage collected.<br>
+   * New executors may be added afterwards but this method is mainly meant for
+   * safe cleanup.
+   *
+   * @return {@link EChange}
+   */
+  @Nonnull
+  EChange removeAllExecutors ();
+}
diff --git a/phive-api/src/main/java/com/helger/phive/api/executorset/ValidationExecutorSet.java b/phive-api/src/main/java/com/helger/phive/api/executorset/ValidationExecutorSet.java
index 015b41df..60c22034 100644
--- a/phive-api/src/main/java/com/helger/phive/api/executorset/ValidationExecutorSet.java
+++ b/phive-api/src/main/java/com/helger/phive/api/executorset/ValidationExecutorSet.java
@@ -45,7 +45,8 @@
  *        The validation source type to be used.
  */
 @NotThreadSafe
-public class ValidationExecutorSet <SOURCETYPE extends IValidationSource> implements IValidationExecutorSet <SOURCETYPE>
+public class ValidationExecutorSet <SOURCETYPE extends IValidationSource> implements
+                                   IValidationExecutorSetMutable <SOURCETYPE>
 {
   private final DVRCoordinate m_aVESID;
   private final String m_sDisplayName;
@@ -103,13 +104,6 @@ public final IValidationExecutorSetStatus getStatus ()
     return m_aStatus;
   }
 
-  /**
-   * Add a single executor.
-   *
-   * @param aExecutor
-   *        The executor to be added. May not be <code>null</code>.
-   * @return this for chaining
-   */
   @Nonnull
   public ValidationExecutorSet <SOURCETYPE> addExecutor (@Nonnull final IValidationExecutor <SOURCETYPE> aExecutor)
   {
@@ -125,15 +119,6 @@ public void setValidationExecutorDoCache (final boolean bCache)
         ((IValidationExecutorCacheSupport) aExecutor).setCacheArtefact (bCache);
   }
 
-  /**
-   * As some {@link IValidationExecutor} instances may contain a hard reference
-   * to a {@link ClassLoader} this methods removes all executors and allows for
-   * them to be garbage collected.<br>
-   * New executors may be added afterwards but this method is mainly meant for
-   * safe cleanup.
-   *
-   * @return {@link EChange}
-   */
   @Nonnull
   public EChange removeAllExecutors ()
   {
diff --git a/phive-api/src/main/java/com/helger/phive/api/executorset/ValidationExecutorSetAlias.java b/phive-api/src/main/java/com/helger/phive/api/executorset/ValidationExecutorSetAlias.java
new file mode 100644
index 00000000..a1b257a6
--- /dev/null
+++ b/phive-api/src/main/java/com/helger/phive/api/executorset/ValidationExecutorSetAlias.java
@@ -0,0 +1,149 @@
+/*
+ * Copyright (C) 2014-2024 Philip Helger (www.helger.com)
+ * philip[at]helger[dot]com
+ *
+ * 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 com.helger.phive.api.executorset;
+
+import java.util.Iterator;
+
+import javax.annotation.Nonnull;
+import javax.annotation.concurrent.NotThreadSafe;
+
+import com.helger.commons.ValueEnforcer;
+import com.helger.commons.annotation.Nonempty;
+import com.helger.commons.annotation.ReturnsMutableCopy;
+import com.helger.commons.annotation.ReturnsMutableObject;
+import com.helger.commons.collection.impl.ICommonsList;
+import com.helger.commons.hashcode.HashCodeGenerator;
+import com.helger.commons.state.EChange;
+import com.helger.commons.string.ToStringGenerator;
+import com.helger.diver.api.coord.DVRCoordinate;
+import com.helger.phive.api.executor.IValidationExecutor;
+import com.helger.phive.api.executorset.status.IValidationExecutorSetStatus;
+import com.helger.phive.api.source.IValidationSource;
+
+/**
+ * An implementation of {@link IValidationExecutorSet} that acts as an alias to
+ * another {@link IValidationExecutorSet} with a different ID.
+ *
+ * @author Philip Helger
+ * @param <SOURCETYPE>
+ *        The validation source type to be used.
+ * @since 10.0.4
+ */
+@NotThreadSafe
+public class ValidationExecutorSetAlias <SOURCETYPE extends IValidationSource> implements
+                                        IValidationExecutorSetMutable <SOURCETYPE>
+{
+  private final DVRCoordinate m_aVESID;
+  private final String m_sDisplayName;
+  private final IValidationExecutorSetMutable <SOURCETYPE> m_aVES;
+
+  public ValidationExecutorSetAlias (@Nonnull final DVRCoordinate aVESID,
+                                     @Nonnull @Nonempty final String sDisplayName,
+                                     @Nonnull final IValidationExecutorSetMutable <SOURCETYPE> aVES)
+  {
+    ValueEnforcer.notNull (aVESID, "ID");
+    ValueEnforcer.notEmpty (sDisplayName, "DisplayName");
+    ValueEnforcer.notNull (aVES, "Status");
+    m_aVESID = aVESID;
+    m_sDisplayName = sDisplayName;
+    m_aVES = aVES;
+  }
+
+  @Nonnull
+  public final DVRCoordinate getID ()
+  {
+    return m_aVESID;
+  }
+
+  @Nonnull
+  @Nonempty
+  public final String getDisplayName ()
+  {
+    return m_sDisplayName;
+  }
+
+  @Nonnull
+  public final Iterator <IValidationExecutor <SOURCETYPE>> iterator ()
+  {
+    return m_aVES.iterator ();
+  }
+
+  @Nonnull
+  @ReturnsMutableObject
+  public final ICommonsList <IValidationExecutor <SOURCETYPE>> executors ()
+  {
+    return m_aVES.executors ();
+  }
+
+  @Nonnull
+  @ReturnsMutableCopy
+  public final ICommonsList <IValidationExecutor <SOURCETYPE>> getAllExecutors ()
+  {
+    return m_aVES.getAllExecutors ();
+  }
+
+  @Nonnull
+  public final IValidationExecutorSetStatus getStatus ()
+  {
+    return m_aVES.getStatus ();
+  }
+
+  @Nonnull
+  public ValidationExecutorSetAlias <SOURCETYPE> addExecutor (@Nonnull final IValidationExecutor <SOURCETYPE> aExecutor)
+  {
+    m_aVES.addExecutor (aExecutor);
+    return this;
+  }
+
+  public void setValidationExecutorDoCache (final boolean bCache)
+  {
+    m_aVES.setValidationExecutorDoCache (bCache);
+  }
+
+  @Nonnull
+  public EChange removeAllExecutors ()
+  {
+    return m_aVES.removeAllExecutors ();
+  }
+
+  @Override
+  public boolean equals (final Object o)
+  {
+    if (o == this)
+      return true;
+    if (o == null || !getClass ().equals (o.getClass ()))
+      return false;
+    final ValidationExecutorSetAlias <?> rhs = (ValidationExecutorSetAlias <?>) o;
+    return m_aVESID.equals (rhs.m_aVESID) && m_sDisplayName.equals (rhs.m_sDisplayName) && m_aVES.equals (rhs.m_aVES);
+  }
+
+  @Override
+  public int hashCode ()
+  {
+    return new HashCodeGenerator (this).append (m_aVESID).append (m_sDisplayName).append (m_aVES).getHashCode ();
+  }
+
+  @Override
+  public String toString ()
+  {
+    return ToStringGenerator.getDerived (super.toString ())
+                            .append ("ID", m_aVESID)
+                            .append ("DisplayName", m_sDisplayName)
+                            .append ("VES", m_aVES)
+                            .getToString ();
+  }
+}