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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) 2003-2005, Open Geospatial Consortium Inc.
 *
 *    All Rights Reserved. http://www.opengis.org/legal/
 */
package org.opengis.geometry.primitive;

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

import org.opengis.annotation.UML;

/**
 * The boundary of {@linkplain Solid solids}. Solid boundaries are similar to {@linkplain
 * SurfaceBoundary surface boundaries}. In normal 3-dimensional Euclidean space, one {@linkplain
 * Shell shell} is distinguished as the exterior. In the more general case, this is not always
 * possible.
 *
 * 
 *
 *  NOTE: An alternative use of solids with no external shell would be
 * to define "complements" of finite solids. These infinite solids would have only interior
 * boundaries. If this specification is extended to 4D Euclidean space, or if 3D compact manifolds
 * are used (probably not in geographic information), then other examples of bounded solids without
 * exterior boundaries are possible. 
 *
 * 
 *
 * @version ISO 19107
 * @author Martin Desruisseaux (IRD)
 * @since GeoAPI 1.0
 * @see SurfaceBoundary
 */
@UML(identifier = "GM_SolidBoundary", specification = ISO_19107)
public interface SolidBoundary extends PrimitiveBoundary {
    /**
     * Returns the exterior shell, or {@code null} if none.
     *
     * @return The exterior shell, or {@code null}.
     */
    @UML(identifier = "exterior", obligation = MANDATORY, specification = ISO_19107)
    Shell getExterior();

    /**
     * Returns the interior shells.
     *
     * @return The interior shells. Never {@code null}, but may be an empty array.
     */
    @UML(identifier = "interior", obligation = MANDATORY, specification = ISO_19107)
    Shell[] getInteriors();
}