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Only the Java Core part of Javolution library, with slight modifications for use in MSFTBX.

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/*
 * Javolution - Java(TM) Solution for Real-Time and Embedded Systems
 * Copyright (C) 2012 - Javolution (http://javolution.org/)
 * All rights reserved.
 * 
 * Permission to use, copy, modify, and distribute this software is
 * freely granted, provided that this notice is preserved.
 */
package javolution.xml.stream;

/**
 * Provides information on the location of an event.
 * 
 * @author  Jean-Marie Dautelle
 * @version 3.8, May 22, 2006
 */
public interface Location {

    /**
     * Return the line number where the current event ends,
     * returns -1 if none is available.
     * @return the current line number
     */
    int getLineNumber();

    /**
     * Return the column number where the current event ends,
     * returns -1 if none is available.
     * @return the current column number
     */
    int getColumnNumber();

    /**
     * Return the byte or character offset into the input source this location
     * is pointing to. If the input source is a file or a byte stream then 
     * this is the byte offset into that stream, but if the input source is 
     * a character media then the offset is the character offset. 
     * Returns -1 if there is no offset available.
     * 
     * @return the current offset
     */
    int getCharacterOffset();

    /**
     * Returns the public ID of the XML
     * 
     * @return the public ID, or null if not available
     */
    public String getPublicId();

    /**
     * Returns the system ID of the XML
     * @return the system ID, or null if not available
     */
    public String getSystemId();
}