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. 
/*
 * 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;


The XML Schema API operations only raise exceptions in "exceptional" 
circumstances, i.e., when an operation is impossible to perform (either 
for logical reasons, because data is lost, or because the implementation 
has become unstable).

Implementations should raise other exceptions under other circumstances. 

Some languages and object systems do not support the concept of 
exceptions. For such systems, error conditions may be indicated using 
native error reporting mechanisms. For some bindings, for example, 
methods may return error codes similar to those listed in the 
corresponding method descriptions.

/**
 * The XML Schema API operations only raise exceptions in "exceptional" 
 * circumstances, i.e., when an operation is impossible to perform (either 
 * for logical reasons, because data is lost, or because the implementation 
 * has become unstable).
 * <p>Implementations should raise other exceptions under other circumstances. 
 * <p>Some languages and object systems do not support the concept of 
 * exceptions. For such systems, error conditions may be indicated using 
 * native error reporting mechanisms. For some bindings, for example, 
 * methods may return error codes similar to those listed in the 
 * corresponding method descriptions.
 */
public class XSException extends RuntimeException {

    
Serialization version. 
/** Serialization version. */
    static final long serialVersionUID = 3111893084677917742L;
    
    public XSException(short code, String message) {
       super(message);
       this.code = code;
    }
    public short   code;
    // ExceptionCode
    
If the implementation does not support the requested type of object or 
operation.

/**
     * If the implementation does not support the requested type of object or 
     * operation.
     */
    public static final short NOT_SUPPORTED_ERR         = 1;
    
If index or size is negative, or greater than the allowed value

/**
     * If index or size is negative, or greater than the allowed value
     */
    public static final short INDEX_SIZE_ERR            = 2;

}