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A slightly adapted version of Xerces 2.11.0 to allow the XMLStringBuffer responsible for XML attribute scanning to start larger and thus avoid extended appending times. The initial buffer size is controlled by settting the system property julielab.xerces.attributebuffersize (also available as constant XMLScanner#ATTRIBUTE_BUFFER_SIZE).

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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 Model Group schema component.
 */
public interface XSModelGroup extends XSTerm {
    // Content model compositors
    /**
     * This constant value signifies a sequence operator.
     */
    public static final short COMPOSITOR_SEQUENCE       = 1;
    /**
     * This constant value signifies a choice operator.
     */
    public static final short COMPOSITOR_CHOICE         = 2;
    /**
     * This content model represents a simplified version of the SGML 
     * &-Connector and is limited to the top-level of any content model. 
     * No element in the all content model may appear more than once.
     */
    public static final short COMPOSITOR_ALL            = 3;

    /**
     * [compositor]: one of all, choice or sequence. The valid constant values 
     * are: 
     * COMPOSITOR_SEQUENCE, COMPOSITOR_CHOICE, COMPOSITOR_ALL. 
     */
    public short getCompositor();

    /**
     *  A list of [particles] if it exists, otherwise an empty 
     * XSObjectList. 
     */
    public XSObjectList getParticles();

    /**
     * An annotation if it exists, otherwise null. If not null
     * then the first [annotation] from the sequence of annotations.
     */
    public XSAnnotation getAnnotation();

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