--- /dev/null
+package org.apache.lucene.facet.search;
+
+import java.io.IOException;
+
+import org.apache.lucene.search.DocIdSet;
+
+/**
+ * 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.
+ */
+
+/**
+ * Document IDs with scores for each, driving facets accumulation. Document
+ * scores are optionally used in the process of facets scoring.
+ *
+ * @see FacetsAccumulator#accumulate(ScoredDocIDs)
+ * @lucene.experimental
+ */
+public interface ScoredDocIDs {
+
+ /** Returns an iterator over the document IDs and their scores. */
+ public ScoredDocIDsIterator iterator() throws IOException;
+
+ /** Returns the set of doc IDs. */
+ public DocIdSet getDocIDs();
+
+ /** Returns the number of scored documents. */
+ public int size();
+
+}