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    <p>Please see the following XSD schemas and JAXB implementations to accomplish defining an abstract class for the Message’s Body</p> <p>XmlMessage.xsd to define the format of all messages:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://www.samnunnally.com" targetNamespace="http://www.samnunnally.com" version="1.0"&gt; &lt;xs:element name="xmlMessage"&gt; &lt;xs:complexType&gt; &lt;xs:sequence&gt; &lt;xs:element name="header" type="header" minOccurs="1" maxOccurs="1"/&gt; &lt;xs:element ref="body"/&gt; &lt;/xs:sequence&gt; &lt;/xs:complexType&gt; &lt;/xs:element&gt; &lt;xs:complexType name="header"&gt; &lt;xs:sequence&gt; &lt;xs:element name="message_class" type="xs:string"/&gt; &lt;xs:element name="message_id" type="xs:int"/&gt; &lt;xs:element name="message_length" type="xs:int"/&gt; &lt;xs:element name="software_version" type="xs:string"/&gt; &lt;xs:element name="correlation_id" type="xs:string"/&gt; &lt;xs:element name="session_id" type="xs:string"/&gt; &lt;xs:element name="return_code" type="xs:string"/&gt; &lt;/xs:sequence&gt; &lt;/xs:complexType&gt; &lt;xs:element name="body" type="body"/&gt; &lt;xs:complexType name="body" abstract="true"&gt; &lt;xs:sequence/&gt; &lt;/xs:complexType&gt; </code></pre> <p></p> <p>Example xsd implementing XmlMessage.xsd. Ends up being message Foo containing a list of customers. The key is to use substitutionGroup attribute and xs:extension base="body"</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://www.samnunnally.com" targetNamespace="http://www.samnunnally.com" version="1.0"&gt; &lt;xs:include schemaLocation="XmlMessage.xsd"/&gt; &lt;xs:element name="foo" type="foo" substitutionGroup="body"/&gt; &lt;xs:complexType name="foo"&gt; &lt;xs:complexContent&gt; &lt;xs:extension base="body"&gt; &lt;xs:sequence&gt; &lt;xs:element name="customers" type="customer" minOccurs="1" maxOccurs="unbounded"/&gt; &lt;/xs:sequence&gt; &lt;/xs:extension&gt; &lt;/xs:complexContent&gt; &lt;/xs:complexType&gt; &lt;xs:complexType name="customer"&gt; &lt;xs:sequence&gt; &lt;xs:element name="customer_id" type="customerId" nillable="false" minOccurs="1" maxOccurs="1"/&gt; &lt;xs:element name="name" type="xs:string"/&gt; &lt;xs:element name="street" type="xs:string"/&gt; &lt;xs:element name="city" type="xs:string"/&gt; &lt;xs:element name="state" type="xs:string"/&gt; &lt;xs:element name="zip" type="xs:string"/&gt; &lt;xs:element name="phone" type="xs:string"/&gt; &lt;/xs:sequence&gt; &lt;/xs:complexType&gt; &lt;xs:complexType name="customerId"&gt; &lt;xs:sequence&gt; &lt;xs:element name="id" type="xs:string" minOccurs="1" maxOccurs="1"/&gt; &lt;/xs:sequence&gt; &lt;/xs:complexType&gt; </code></pre> <p></p> <p>Key Java classes generated by JAXB:</p> <p>Message:</p> <pre><code>package com.samnunnally; import javax.xml.bind.JAXBElement; import javax.xml.bind.annotation.XmlAccessType; import javax.xml.bind.annotation.XmlAccessorType; import javax.xml.bind.annotation.XmlElement; import javax.xml.bind.annotation.XmlElementRef; import javax.xml.bind.annotation.XmlRootElement; import javax.xml.bind.annotation.XmlType; @XmlAccessorType(XmlAccessType.FIELD) @XmlType(name = "", propOrder = { "header", "body" }) @XmlRootElement(name = "xmlMessage") public class XmlMessage { @XmlElement(required = true) protected Header header; @XmlElementRef(name = "body", namespace = "http://www.samnunnally.com", type = JAXBElement.class) protected JAXBElement&lt;? extends Body&gt; body; public Header getHeader() { return header; } public void setHeader(Header value) { this.header = value; } public JAXBElement&lt;? extends Body&gt; getBody() { return body; } public void setBody(JAXBElement&lt;? extends Body&gt; value) { this.body = value; } } </code></pre> <p>Body:</p> <pre><code>package com.samnunnally; import javax.xml.bind.annotation.XmlAccessType; import javax.xml.bind.annotation.XmlAccessorType; import javax.xml.bind.annotation.XmlSeeAlso; import javax.xml.bind.annotation.XmlType; @XmlAccessorType(XmlAccessType.FIELD) @XmlType(name = "body") @XmlSeeAlso({ Foo.class }) public abstract class Body { } </code></pre> <p>Foo message:</p> <pre><code>package com.samnunnally; import java.util.ArrayList; import java.util.List; import javax.xml.bind.annotation.XmlAccessType; import javax.xml.bind.annotation.XmlAccessorType; import javax.xml.bind.annotation.XmlElement; import javax.xml.bind.annotation.XmlType; @XmlAccessorType(XmlAccessType.FIELD) @XmlType(name = "foo", propOrder = { "customers" }) public class Foo extends Body { @XmlElement(required = true) protected List&lt;Customer&gt; customers; public List&lt;Customer&gt; getCustomers() { if (customers == null) { customers = new ArrayList&lt;Customer&gt;(); } return this.customers; } } </code></pre>
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