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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.xerces.xs;

/**
 * This interface represents the Identity-constraint Definition schema 
 * component.
 */
public interface XSIDCDefinition extends XSObject {
    // Identity Constraints
    /**
     * See the definition of key in the identity-constraint 
     * category.
     */
    public static final short IC_KEY                    = 1;
    /**
     * See the definition of keyref in the identity-constraint 
     * category.
     */
    public static final short IC_KEYREF                 = 2;
    /**
     * See the definition of unique in the identity-constraint 
     * category.
     */
    public static final short IC_UNIQUE                 = 3;

    /**
     * [identity-constraint category]: one of key, keyref or unique. 
     */
    public short getCategory();

    /**
     * [selector]: a restricted XPath 1.0 expression. 
     */
    public String getSelectorStr();

    /**
     * [fields]: a non-empty list of restricted  XPath 1.0 expressions. 
     */
    public StringList getFieldStrs();

    /**
     * [referenced key]: required if [identity-constraint category] is keyref, 
     * null otherwise. An identity-constraint definition with [
     * identity-constraint category] equal to key or unique. 
     */
    public XSIDCDefinition getRefKey();

    /**
     * A sequence of [annotations] or an empty  XSObjectList. 
     */
    public XSObjectList getAnnotations();

}