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Standard interfaces implemented throughout the library.

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/*
 *    GeoTools - The Open Source Java GIS Toolkit
 *    http://geotools.org
 *
 *    (C) 2011, Open Source Geospatial Foundation (OSGeo)
 *    (C) 2004-2005, Open Geospatial Consortium Inc.
 *
 *    All Rights Reserved. http://www.opengis.org/legal/
 */
package org.opengis.metadata.extent;

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

import java.util.Collection;
import org.opengis.annotation.UML;
import org.opengis.util.InternationalString;

/**
 * Information about spatial, vertical, and temporal extent. This interface has four optional
 * attributes ({@linkplain #getGeographicElements geographic elements}, {@linkplain
 * #getTemporalElements temporal elements}, and {@linkplain #getVerticalElements vertical elements})
 * and an element called {@linkplain #getDescription description}. At least one of the four shall be
 * used.
 *
 * @version ISO 19115
 * @author Martin Desruisseaux (IRD)
 * @since GeoAPI 1.0
 */
@UML(identifier = "EX_Extent", specification = ISO_19115)
public interface Extent {
    /**
     * Returns the spatial and temporal extent for the referring object.
     *
     * @return The spatial and temporal extent, or {@code null} in none.
     */
    @UML(identifier = "description", obligation = CONDITIONAL, specification = ISO_19115)
    InternationalString getDescription();

    /**
     * Provides geographic component of the extent of the referring object
     *
     * @return The geographic extent, or an empty set if none.
     */
    @UML(identifier = "geographicElement", obligation = CONDITIONAL, specification = ISO_19115)
    Collection getGeographicElements();

    /**
     * Provides temporal component of the extent of the referring object
     *
     * @return The temporal extent, or an empty set if none.
     */
    @UML(identifier = "temporalElement", obligation = CONDITIONAL, specification = ISO_19115)
    Collection getTemporalElements();

    /**
     * Provides vertical component of the extent of the referring object
     *
     * @return The vertical extent, or an empty set if none.
     */
    @UML(identifier = "verticalElement", obligation = CONDITIONAL, specification = ISO_19115)
    Collection getVerticalElements();
}