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The Apache Commons Codec package contains simple encoder and decoders for various formats such as Base64 and Hexadecimal. In addition to these widely used encoders and decoders, the codec package also maintains a collection of phonetic encoding utilities.

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/*   Copyright 2004 The Apache Software Foundation
 *
 *   Licensed 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.xmlbeans;

import javax.xml.namespace.QName;

import java.math.BigInteger;

/**
 * Represents an element or an attribute declaration.
 * 
 * @see SchemaType#getContainerField
 * @see SchemaLocalElement
 * @see SchemaLocalAttribute
 */ 
public interface SchemaField
{
    /**
     * Returns the form-unqualified-or-qualified name.
     */
    QName getName();

    /**
     * True if this use is an attribute
     */
    boolean isAttribute();

    /**
     * True if nillable; always false for attributes.
     */
    boolean isNillable();

    /**
     * Returns the type of this use.
     */
    SchemaType getType();

    /**
     * Returns the minOccurs value for this particle.
     * If it is not specified explicitly, this defaults to BigInteger.ONE.
     */
    BigInteger getMinOccurs();

    /**
     * Returns the maxOccurs value for this particle, or null if it
     * is unbounded.
     * If it is not specified explicitly, this defaults to BigInteger.ONE.
     */
    BigInteger getMaxOccurs();

    /**
     * The default value as plain text. See {@link #isDefault} and {@link #isFixed}.
     */
    String getDefaultText();
    
    /**
     * The default value as a strongly-typed value.  See {@link #isDefault} and {@link #isFixed}.
     */
    XmlAnySimpleType getDefaultValue();

    /**
     * True if a default is supplied. If {@link #isFixed}, then isDefault is always true.
     */
    boolean isDefault();

    /**
     * True if the value is fixed.
     */
    boolean isFixed();

    /**
     * Returns user-specific information.
     * @see SchemaBookmark
     */
    Object getUserData();
}