https://xerces.apache.org/xerces2-j/: Xerces2 is the next generation of high performance, fully compliant XML parsers in the Apache Xerces family. This new version of Xerces introduces the Xerces Native Interface (XNI), a complete framework for building parser components and configurations that is extremely modular and easy to program. The Apache Xerces2 parser is the reference implementation of XNI but other parser components, configurations, and parsers can be written using the Xerces Native Interface. For complete design and implementation documents, refer to the XNI Manual. Xerces2 is a fully conforming XML Schema 1.0 processor. A partial experimental implementation of the XML Schema 1.1 Structures and Datatypes Working Drafts (December 2009) and an experimental implementation of the XML Schema Definition Language (XSD): Component Designators (SCD) Candidate Recommendation (January 2010) are provided for evaluation. For more information, refer to the XML Schema page. Xerces2 also provides a complete implementation of the Document Object Model Level 3 Core and Load/Save W3C Recommendations and provides a complete implementation of the XML Inclusions (XInclude) W3C Recommendation. It also provides support for OASIS XML Catalogs v1.1. Xerces2 is able to parse documents written according to the XML 1.1 Recommendation, except that it does not yet provide an option to enable normalization checking as described in section 2.13 of this specification. It also handles namespaces according to the XML Namespaces 1.1 Recommendation, and will correctly serialize XML 1.1 documents if the DOM level 3 load/save APIs are in use. 
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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
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package org.apache.xerces.xs;


This interface represents the Identity-constraint Definition schema 
component.

/**
 * 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.

/**
     * See the definition of <code>key</code> in the identity-constraint 
     * category.
     */
    public static final short IC_KEY                    = 1;
    
See the definition of keyref in the identity-constraint 
category.

/**
     * See the definition of <code>keyref</code> in the identity-constraint 
     * category.
     */
    public static final short IC_KEYREF                 = 2;
    
See the definition of unique in the identity-constraint 
category.

/**
     * See the definition of <code>unique</code> in the identity-constraint 
     * category.
     */
    public static final short IC_UNIQUE                 = 3;

    
[identity-constraint category]: one of key, keyref or unique. 

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

    
[selector]: a restricted XPath 1.0 expression. 

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

    
[fields]: a non-empty list of restricted  XPath 1.0 expressions. 

/**
     * [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. 

/**
     * [referenced key]: required if [identity-constraint category] is keyref, 
     * <code>null</code> 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. 

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

}