Add class description and copyright header
+// Copyright 2017 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.searchdefinition.document;
import com.yahoo.document.DataType;
@@ -5,6 +6,9 @@ import com.yahoo.document.TemporaryStructuredDataType;
import com.yahoo.document.datatypes.FieldValue;
/**
+ * Represents a reference field inside a SD document. This is temporary AST structure that only referes to the
+ * target document type by name ({@link TemporaryStructuredDataType}.
+ *
* @author bjorncs
*/
public class TemporaryReferenceField extends DataType {
