--- /dev/null
+package org.apache.lucene.facet.search.results;
+
+import org.apache.lucene.facet.search.FacetResultsHandler;
+import org.apache.lucene.facet.search.params.FacetRequest;
+
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+
+/**
+ * Intermediate {@link FacetResult} of faceted search.
+ * <p>
+ * This is an empty interface on purpose.
+ * <p>
+ * It allows {@link FacetResultsHandler} to return intermediate result objects
+ * that only it knows how to interpret, and so the handler has maximal freedom
+ * in defining what an intermediate result is, depending on its specific logic.
+ *
+ * @lucene.experimental
+ */
+public interface IntermediateFacetResult {
+
+ /**
+ * Facet request for which this temporary result was created.
+ */
+ FacetRequest getFacetRequest();
+
+}