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Commons XMLSchema is a light weight schema object model that can be used to manipualte or generate a schema. It has a clean, easy to use API and can easily be integrated into an existing project since it has almost no dependancies on third party libraries.
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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.ws.commons.schema;

import org.apache.ws.commons.schema.constants.Constants;

import javax.xml.namespace.QName;


/**
 * Class for elements. Represents the World Wide Web Consortium (W3C) element element.
 */

public class XmlSchemaElement extends XmlSchemaParticle implements TypeReceiver {

    /**
     * Attribute used to block a type derivation.
     */
    XmlSchemaDerivationMethod block;

    /**
     * The value after an element has been compiled to post-schema infoset.
     * This value is either from the type itself or, if not defined on the type, taken from the schema element.
     */
    XmlSchemaDerivationMethod blockResolved;
    XmlSchemaObjectCollection constraints;

    /**
     * Provides the default value of the element if its content
     * is a simple type or the element's content is textOnly.
     */
    String defaultValue;
    String fixedValue;

    /**
     * Returns the correct common runtime library
     * object based upon the SchemaType for the element.
     */
    Object elementType;

    XmlSchemaDerivationMethod finalDerivation;
    XmlSchemaDerivationMethod finalDerivationResolved;

    /**
     * The default value is the value of the elementFormDefault attribute for the schema element containing the attribute.
     * The default is Unqualified.
     */
    XmlSchemaForm form;
    boolean isAbstract;
    boolean isNillable;
    String name;
    QName qualifiedName;
    QName refName;

    /**
     * Returns the type of the element.
     * This can either be a complex type or a simple type.
     */
    XmlSchemaType schemaType;

    /**
     * QName of a built-in data type defined in this schema or another
     * schema indicated by the specified namespace.
     */
    QName schemaTypeName;

    /**
     * QName of an element that can be a substitute for this element.
     */
    QName substitutionGroup;

    /**
     * Creates new XmlSchemaElement
     */
    public XmlSchemaElement() {
        constraints = new XmlSchemaObjectCollection();
        isAbstract = false;
        isNillable = false;
        form = new XmlSchemaForm(XmlSchemaForm.NONE);
        finalDerivation = new XmlSchemaDerivationMethod(Constants.BlockConstants.NONE);
        block = new XmlSchemaDerivationMethod(Constants.BlockConstants.NONE);
    }

    /**
     * Returns a collection of constraints on the element.
     */
    public XmlSchemaObjectCollection getConstraints() {
        return constraints;
    }

    public String getDefaultValue() {
        return defaultValue;
    }

    public void setDefaultValue(String defaultValue) {
        this.defaultValue = defaultValue;
    }

    public XmlSchemaDerivationMethod getBlock() {
        return block;
    }

    public void setBlock(XmlSchemaDerivationMethod block) {
        this.block = block;
    }

    public XmlSchemaDerivationMethod getFinal() {
        return finalDerivation;
    }

    public void setFinal(XmlSchemaDerivationMethod finalDerivation) {
        this.finalDerivation = finalDerivation;
    }

    public XmlSchemaDerivationMethod getBlockResolved() {
        return blockResolved;
    }

    public String getFixedValue() {
        return fixedValue;
    }

    public void setFixedValue(String fixedValue) {
        this.fixedValue = fixedValue;
    }

    public Object getElementType() {
        return elementType;
    }

    public XmlSchemaForm getForm() {
        return form;
    }

    public void setForm(XmlSchemaForm form) {
        this.form = form;
    }

    public boolean isAbstract() {
        return isAbstract;
    }

    public void setAbstract(boolean isAbstract) {
        this.isAbstract = isAbstract;
    }

    public boolean isNillable() {
        return isNillable;
    }

    public void setNillable(boolean isNillable) {
        this.isNillable = isNillable;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public QName getRefName() {
        return refName;
    }

    public void setRefName(QName refName) {
        this.refName = refName;
    }

    public QName getQName() {
        return qualifiedName;
    }

    public void setQName(QName qualifiedName) {
        this.qualifiedName = qualifiedName;
    }

    public XmlSchemaType getSchemaType() {
        return schemaType;
    }

    public void setSchemaType(XmlSchemaType schemaType) {
        this.schemaType = schemaType;
    }

    public QName getSchemaTypeName() {
        return schemaTypeName;
    }

    public void setSchemaTypeName(QName schemaTypeName) {
        this.schemaTypeName = schemaTypeName;
    }

    public QName getSubstitutionGroup() {
        return substitutionGroup;
    }

    public void setSubstitutionGroup(QName substitutionGroup) {
        this.substitutionGroup = substitutionGroup;
    }

    public String toString(String prefix, int tab) {
        String xml = new String();

        if (!prefix.equals("") && prefix.indexOf(":") == -1)
            prefix += ":";

        for (int i = 0; i < tab; i++)
            xml += "\t";

        xml += "<" + prefix + "element ";

        if (!name.equals(""))
            xml += "name=\"" + name + "\" ";

        if (schemaTypeName != null)
            xml += "type=\"" + schemaTypeName + "\"";

        if (refName != null)
            xml += "ref=\"" + refName + "\" ";

        if (minOccurs != 1)
            xml += "minOccurs=\"" + minOccurs + "\" ";

        if (maxOccurs != 1)
            xml += "maxOccurs=\"" + maxOccurs + "\" ";
        
        if (isNillable)
          xml += "nillable=\"" + isNillable + "\" ";

        xml += ">\n";

        if (constraints != null)
            xml += constraints.toString(prefix, (tab + 1));

        if (schemaType != null) {
            xml += schemaType.toString(prefix, (tab + 1));
        }
        for (int i = 0; i < tab; i++)
            xml += "\t";

        xml += "\n";

        return xml;
    }

    public void setType(XmlSchemaType type) {
        this.schemaType = type;
    }
}