/*
 *    GeoTools - The Open Source Java GIS Toolkit
 *    http://geotools.org
 *
 *    (C) 2011, Open Source Geospatial Foundation (OSGeo)
 *    (C) 2005, Open Geospatial Consortium Inc.
 *    
 *    All Rights Reserved. http://www.opengis.org/legal/
 */
package org.opengis.temporal;

import org.opengis.metadata.Identifier;
import org.opengis.metadata.extent.Extent;
import org.opengis.referencing.ReferenceIdentifier;
import org.opengis.referencing.ReferenceSystem;
import org.opengis.annotation.UML;

import static org.opengis.annotation.Obligation.*;
import static org.opengis.annotation.Specification.*;


/**
 * Provides information about a temporal reference system.
 * <p>
 * This interface is similar to ReferenceSytem and may be deprecated
 * in the future. It is made available currently in order to *exactly*
 * match this ISO 19108 specification with a "domain of validity"
 * association to an Extent.
 * </p>
 * @author Stephane Fellah (Image Matters)
 * @author Alexander Petkov
 *
 * @source $URL: http://svn.osgeo.org/geotools/trunk/modules/library/opengis/src/main/java/org/opengis/temporal/TemporalReferenceSystem.java $
 */
@UML(identifier="TM_ReferenceSystem", specification=ISO_19108)
public interface TemporalReferenceSystem extends ReferenceSystem {
    /**
     * Provides a name that uniquely identifies the temporal referece system.
     *
     * Currently returns MD_Identifier, which is defined in ISO 19115, while ISO 19108
     * requires that RS_Identifier (defined in ISO 19111 and http://www.opengis.org/docs/03-073r1.zip)
     * is returned. From the looks of it, org.opengis.referencing.ReferenceSystem could also fit the bill.
     *
     * @return {@link ReferenceIdentifier} for the temporal reference system
     */
    @UML(identifier="name", obligation=MANDATORY, specification=ISO_19108)
    ReferenceIdentifier getName();

    /**
     * Identifies the space and time within which the reference system is applicable.
     * The return type allows for describing both spatial and temporal extent.
     * This attribute shall be used whenever an application schema includes
     * {@link TemporalPosition}s referenced to a reference system which has a valid extent
     * that is less than the extent of a data set containing such values.
     * <p>
     * Please note this is very similar to ReferenceSystem.getValidArea() from ISO 19115.
     */
    @UML(identifier="DomainOfValidity", obligation=MANDATORY, specification=ISO_19108)
    Extent getDomainOfValidity();
}