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The XPath engine used by HtmlUnit.

There is a newer version: 4.7.0

/*
 * 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 org.htmlunit.xpath;

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.
 *
 * Note: This interface should not be considered stable. Only exprSetParent and exprGetParent can
 * be counted on to work reliably. Work in progress.
 */
public interface ExpressionNode extends SourceLocator {
  /** This pair of methods are used to inform the node of its parent. */
  void exprSetParent(ExpressionNode n);

  ExpressionNode exprGetParent();
}