DublinCore.java

/**
 * 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.apache.nutch.metadata;


/**
 * A collection of Dublin Core metadata names.
 *
 * @see <a href="http://dublincore.org">dublincore.org</a> 
 *
 * @author Chris Mattmann
 * @author Jérôme Charron
 */
public interface DublinCore {
  
    
  /**
   * Typically, Format may include the media-type or dimensions of the
   * resource. Format may be used to determine the software, hardware or other
   * equipment needed to display or operate the resource. Examples of
   * dimensions include size and duration. Recommended best practice is to
   * select a value from a controlled vocabulary (for example, the list of
   * Internet Media Types [MIME] defining computer media formats).
   */
  public static final String FORMAT = "format";
  
  /**
   * Recommended best practice is to identify the resource by means of a
   * string or number conforming to a formal identification system. Example
   * formal identification systems include the Uniform Resource Identifier
   * (URI) (including the Uniform Resource Locator (URL)), the Digital Object
   * Identifier (DOI) and the International Standard Book Number (ISBN).
   */
  public static final String IDENTIFIER = "identifier";
  
  /**
   * Date on which the resource was changed.
   */
  public static final String MODIFIED = "modified";
  
  /**
   * An entity responsible for making contributions to the content of the
   * resource. Examples of a Contributor include a person, an organisation, or
   * a service. Typically, the name of a Contributor should be used to
   * indicate the entity.
   */
  public static final String CONTRIBUTOR = "contributor";
  
  /**
   * The extent or scope of the content of the resource. Coverage will
   * typically include spatial location (a place name or geographic
   * coordinates), temporal period (a period label, date, or date range) or
   * jurisdiction (such as a named administrative entity). Recommended best
   * practice is to select a value from a controlled vocabulary (for example,
   * the Thesaurus of Geographic Names [TGN]) and that, where appropriate,
   * named places or time periods be used in preference to numeric identifiers
   * such as sets of coordinates or date ranges.
   */
  public static final String COVERAGE = "coverage";
  
  /**
   * An entity primarily responsible for making the content of the resource.
   * Examples of a Creator include a person, an organisation, or a service.
   * Typically, the name of a Creator should be used to indicate the entity.
   */
  public static final String CREATOR = "creator";
  
  /**
   * A date associated with an event in the life cycle of the resource.
   * Typically, Date will be associated with the creation or availability of
   * the resource. Recommended best practice for encoding the date value is
   * defined in a profile of ISO 8601 [W3CDTF] and follows the YYYY-MM-DD
   * format.
   */
  public static final String DATE = "date";
  
  /**
   * An account of the content of the resource. Description may include but is
   * not limited to: an abstract, table of contents, reference to a graphical
   * representation of content or a free-text account of the content.
   */
  public static final String DESCRIPTION = "description";
  
  /**
   * A language of the intellectual content of the resource. Recommended best
   * practice is to use RFC 3066 [RFC3066], which, in conjunction with ISO 639
   * [ISO639], defines two- and three-letter primary language tags with
   * optional subtags. Examples include "en" or "eng" for English, "akk" for
   * Akkadian, and "en-GB" for English used in the United Kingdom.
   */
  public static final String LANGUAGE = "language";
  
  /**
   * An entity responsible for making the resource available. Examples of a
   * Publisher include a person, an organisation, or a service. Typically, the
   * name of a Publisher should be used to indicate the entity.
   */
  public static final String PUBLISHER = "publisher";
  
  /**
   * A reference to a related resource. Recommended best practice is to
   * reference the resource by means of a string or number conforming to a
   * formal identification system.
   */
  public static final String RELATION = "relation";
  
  /**
   * Information about rights held in and over the resource. Typically, a
   * Rights element will contain a rights management statement for the
   * resource, or reference a service providing such information. Rights
   * information often encompasses Intellectual Property Rights (IPR),
   * Copyright, and various Property Rights. If the Rights element is absent,
   * no assumptions can be made about the status of these and other rights
   * with respect to the resource.
   */
  public static final String RIGHTS = "rights";
  
  /**
   * A reference to a resource from which the present resource is derived. The
   * present resource may be derived from the Source resource in whole or in
   * part. Recommended best practice is to reference the resource by means of
   * a string or number conforming to a formal identification system.
   */
  public static final String SOURCE = "source";
  
  /**
   * The topic of the content of the resource. Typically, a Subject will be
   * expressed as keywords, key phrases or classification codes that describe
   * a topic of the resource. Recommended best practice is to select a value
   * from a controlled vocabulary or formal classification scheme.
   */
  public static final String SUBJECT = "subject";
  
  /**
   * A name given to the resource. Typically, a Title will be a name by which
   * the resource is formally known.
   */
  public static final String TITLE = "title";
  
  /**
   * The nature or genre of the content of the resource. Type includes terms
   * describing general categories, functions, genres, or aggregation levels
   * for content. Recommended best practice is to select a value from a
   * controlled vocabulary (for example, the DCMI Type Vocabulary [DCMITYPE]).
   * To describe the physical or digital manifestation of the resource, use
   * the Format element.
   */
  public static final String TYPE = "type";
  
}