--- /dev/null	2017-06-17 22:58:47.330661897 -0700
+++ new/src/java.xml/share/classes/com/sun/org/apache/bcel/internal/classfile/UnknownAttributeReader.java	2017-08-08 16:06:28.497168576 -0700
@@ -0,0 +1,54 @@
+/*
+ * reserved comment block
+ * DO NOT REMOVE OR ALTER!
+ */
+/*
+ * 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.
+ */
+
+package com.sun.org.apache.bcel.internal.classfile;
+
+/**
+ * Unknown (non-standard) attributes may be read via user-defined factory
+ * objects that can be registered with the Attribute.addAttributeReader
+ * method. These factory objects should implement this interface.
+ *
+ * @see Attribute
+ * @version $Id: UnknownAttributeReader.java 1747278 2016-06-07 17:28:43Z britter $
+ * @since 6.0
+ */
+public interface UnknownAttributeReader {
+
+    /**
+     * When this attribute reader is added via the static method Attribute.addAttributeReader,
+     * an attribute name is associated with it. As the class file parser parses attributes,
+     * it will call various AttributeReaders based on the name of the attributes it is constructing.
+     *
+     * @param name_index    An index into the constant pool, indexing a ConstantUtf8
+     *                      that represents the name of the attribute.
+     * @param length        The length of the data contained in the attribute. This is written
+     *                      into the constant pool and should agree with what the factory expects the length to be.
+     * @param file          This is the data input that the factory needs to read its data from.
+     * @param constant_pool This is the constant pool associated with the Attribute that we are constructing.
+     *
+     * @return The user-defined AttributeReader should take this data and use
+     * it to construct an attribute.  In the case of errors, a null can be
+     * returned which will cause the parsing of the class file to fail.
+     *
+     * @see Attribute#addAttributeReader(String, UnknownAttributeReader)
+     */
+    Attribute createAttribute( int name_index, int length, java.io.DataInput file, ConstantPool constant_pool );
+}