/*
 * 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 Attribute Use schema component. 
 */
public interface XSAttributeUse extends XSObject {
    /**
     * [required]: determines whether this use of an attribute declaration 
     * requires an appropriate attribute information item to be present, or 
     * merely allows it. 
     */
    public boolean getRequired();

    /**
     * [attribute declaration]: provides the attribute declaration itself, 
     * which will in turn determine the simple type definition used. 
     */
    public XSAttributeDeclaration getAttrDeclaration();

    /**
     * Value Constraint: one of default, fixed. 
     */
    public short getConstraintType();

    /**
     * Value Constraint: The constraint value, otherwise <code>null</code>. 
     */
    public String getConstraintValue();

    /**
     * Value Constraint: Binding specific actual constraint value or 
     * <code>null</code> if the value is in error or there is no value 
     * constraint. 
     * @exception XSException
     *   NOT_SUPPORTED_ERR: Raised if the implementation does not support this 
     *   method.
     */
    public Object getActualVC()
                                       throws XSException;

    /**
     * The actual constraint value built-in datatype, e.g. 
     * <code>STRING_DT, SHORT_DT</code>. If the type definition of this 
     * value is a list type definition, this method returns 
     * <code>LIST_DT</code>. If the type definition of this value is a list 
     * type definition whose item type is a union type definition, this 
     * method returns <code>LISTOFUNION_DT</code>. To query the actual 
     * constraint value of the list or list of union type definitions use 
     * <code>itemValueTypes</code>. If the <code>actualNormalizedValue</code>
     *  is <code>null</code>, this method returns <code>UNAVAILABLE_DT</code>
     * . 
     * @exception XSException
     *   NOT_SUPPORTED_ERR: Raised if the implementation does not support this 
     *   method.
     */
    public short getActualVCType()
                                       throws XSException;

    /**
     * In the case the actual constraint value represents a list, i.e. the 
     * <code>actualValueType</code> is <code>LIST_DT</code>, the returned 
     * array consists of one type kind which represents the itemType. If the 
     * actual constraint value represents a list type definition whose item 
     * type is a union type definition, i.e. <code>LISTOFUNION_DT</code>, 
     * for each actual constraint value in the list the array contains the 
     * corresponding memberType kind. For examples, see 
     * <code>ItemPSVI.itemValueTypes</code>. 
     * @exception XSException
     *   NOT_SUPPORTED_ERR: Raised if the implementation does not support this 
     *   method.
     */
    public ShortList getItemValueTypes()
                                       throws XSException;

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