/*
 *    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.annotation.UML;

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


/**
 * A zero dimensional topological primitive in time.
 *
 * @author Alexander Petkov
 *
 * @source $URL: http://svn.osgeo.org/geotools/trunk/modules/library/opengis/src/main/java/org/opengis/temporal/TemporalNode.java $
 */
@UML(identifier="TM_Node", specification=ISO_19108)
public interface TemporalNode extends TemporalTopologicalPrimitive {
    /**
     * An optional association that may link this temporal node
     * to its corresponding instant.
     */
    @UML(identifier="Realization", obligation=OPTIONAL, specification=ISO_19108)
    Instant getRealization();

    /**
     * Links this temporal node to the previous temporal edge.
     */
    @UML(identifier="previousEdge", obligation=MANDATORY, specification=ISO_19108)
    TemporalEdge getPreviousEdge();

    /**
     * Links this temporal node to the next temporal edge.
     */
    @UML(identifier="nextEdge", obligation=MANDATORY, specification=ISO_19108)
    TemporalEdge getNextEdge();
}