--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jaxp/src/com/sun/org/apache/xpath/internal/ExpressionNode.java	Thu Apr 12 08:38:26 2012 -0700
@@ -0,0 +1,53 @@
+/*
+ * reserved comment block
+ * DO NOT REMOVE OR ALTER!
+ */
+/*
+ * Copyright 1999-2004 The Apache Software Foundation.
+ *
+ * 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.
+ */
+/*
+ * $Id: ExpressionNode.java,v 1.1.2.1 2005/08/01 01:30:15 jeffsuttor Exp $
+ */
+package com.sun.org.apache.xpath.internal;
+
+import javax.xml.transform.SourceLocator;
+
+/**
+ * A class that implements this interface can construct expressions,
+ * give information about child and parent expressions,
+ * and give the originating source information.  A class that implements
+ * this interface does not lay any claim to being directly executable.
+ *
+ * <p>Note: This interface should not be considered stable.  Only exprSetParent
+ * and exprGetParent can be counted on to work reliably.  Work in progress.</p>
+ */
+public interface ExpressionNode extends SourceLocator
+{
+  /** This pair of methods are used to inform the node of its
+    parent. */
+  public void exprSetParent(ExpressionNode n);
+  public ExpressionNode exprGetParent();
+
+  /** This method tells the node to add its argument to the node's
+    list of children.  */
+  public void exprAddChild(ExpressionNode n, int i);
+
+  /** This method returns a child node.  The children are numbered
+     from zero, left to right. */
+  public ExpressionNode exprGetChild(int i);
+
+  /** Return the number of children the node has. */
+  public int exprGetNumChildren();
+}