/*
 * 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.
 */
/*
 * $Id$
 */
package org.apache.xpath.axes;

import org.apache.xpath.XPathContext;
 
/**
 * A class that implements this interface is a sub context node list, meaning it
 * is a node list for a location path step for a predicate.
 * @xsl.usage advanced
 */
public interface SubContextList
{

  /**
   * Get the number of nodes in the node list, which, in the XSLT 1 based 
   * counting system, is the last index position.
   *
   *
   * @param xctxt The XPath runtime context.
   *
   * @return the number of nodes in the node list.
   */
  public int getLastPos(XPathContext xctxt);

  /**
   * Get the current sub-context position.
   *
   * @param xctxt The XPath runtime context.
   *
   * @return The position of the current node in the list.
   */
  public int getProximityPosition(XPathContext xctxt);
}