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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.annotation;

import static java.lang.annotation.ElementType.*;
import static java.lang.annotation.RetentionPolicy.*;

import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;

/**
 * An annotation mapping each interface, methods or fields to the UML identifier where they come
 * from.
 *
 * @author Martin Desruisseaux (IRD)
 * @since GeoAPI 2.0
 */
@Documented
@Retention(RUNTIME)
@Target({TYPE, FIELD, METHOD})
public @interface UML {
    /**
     * The UML identifier for the annotated interface, method or code list element. Scripts can use
     * this identifier in order to maps a GeoAPI method to the UML entity where it come from.
     *
     * @return The UML identifier used in the standard.
     */
    String identifier();

    /**
     * The obligation declared in the UML. This metadata can be queried in order to determine if a
     * null value is allowed for the annotated method or not. If the obligation is {@link
     * Obligation#MANDATORY}, then null value are not allowed.
     *
     * @return The obligation declared in the standard.
     */
    Obligation obligation() default Obligation.MANDATORY;

    /**
     * The specification where this UML come from.
     *
     * @return The originating specification.
     */
    Specification specification();
}