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BioJava core module
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// BiblioSubject.java
//
//    [email protected]
//    March 2001
//

/*
 *                    BioJava development code
 *
 * This code may be freely distributed and modified under the
 * terms of the GNU Lesser General Public Licence.  This should
 * be distributed with the code.  If you do not have a copy,
 * see:
 *
 *      http://www.gnu.org/copyleft/lesser.html
 *
 * Copyright for this code is held jointly by the individual
 * authors.  These should be listed in @author doc comments.
 *
 * For more information on the BioJava project and its aims,
 * or to join the biojava-l mailing list, visit the home page
 * at:
 *
 *      http://www.biojava.org/
 *
 */
package org.biojava.bibliography;

import java.util.Hashtable;

/**
 * 
 * It represents the topic of the content of the cited resource.
 * It can be expressed in one or more ways.
 * 
 *
 * @author Martin Senger
 * @version $Id$
 * @since 1.3
 */

public class BiblioSubject {

    /**
     * The keywords are usually (but not limited to) one word long.
     * They are not controlled by any vocabulary.
     */
    public Hashtable keywords = new Hashtable();

    /**
     * The subject headings usually come from standard lists
     * such as Sears List of Subject Headings,
     * or Library of Congress Subject Headings (LCSH).
     * This specification does not specify what list to use but implementors
     * are advised to provide a controlled vocabulary for the list that is used,
     * and to specify the source of subject headings in
     * {@link #subjectHeadingsSource} field. The name of such vocabulary
     * should be equal to {@link BibRefSupport#SUBJECT_HEADINGS}.
     */
    public Hashtable subjectHeadings = new Hashtable();

    /**
     * The source of {@link #subjectHeadings subject headings}.
     * For example:
     * 
     *    SEARS
     *   
 for Sears List of Subject Headings
     *   
 LCSH
     *   
 for Library of Congress Subject Headings (LCSH)
     *   
 MeSH
     *   
 for MEDLINE Mesh Terms
     * 
     */
    public String subjectHeadingsSource;

    /**
     * 
     * Classification code (call number) is usually either Dewey decimal or
     * Congress classification. But this specification does not prescribe it.
     * 
     *
     * 
     * Note that the classification codes are unique (unlike some subject headings).
     * Therefore, they can be even expressed as identifiers using the same notation
     * as used for the {@link BibRef#identifier citation identifiers}.
     * 
     */
    public Hashtable codes = new Hashtable();

}