From: Kaleb Pederson <kaleb.pederson_at_gmail.com>
Date: Fri, 29 Oct 2010 00:04:36 -0700

XJC seems to be completely ignoring mixed="true" on my XML Schema elements. I have a type ST that's a restriction on type ED that extends BIN which is abstract and extends type ANY, also abstract. It can be seen in the following minimized version of the schema:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<xs:schema targetNamespace="urn:hl7-org:v3"
        xmlns:xs="http://www.w3.org/2001/XMLSchema"
        xmlns="urn:hl7-org:v3"
        xmlns:mif="urn:hl7-org:v3/mif"
        elementFormDefault="qualified">

        <xs:complexType name="ST" mixed="true">
        <xs:complexContent>
         <xs:restriction base="ED">
            <xs:sequence>
               <xs:element name="reference" type="xs:string" minOccurs="0" maxOccurs="0"/>
               <xs:element name="thumbnail" type="xs:string" minOccurs="0" maxOccurs="0"/>
            </xs:sequence>
            <xs:attribute name="compression" type="xs:string" use="prohibited"/>
         </xs:restriction>
      </xs:complexContent>
        </xs:complexType>

        <xs:complexType name="ED" mixed="true">
                <xs:complexContent>
                        <xs:extension base="BIN">
                                <xs:sequence>
                                        <xs:element name="reference" type="xs:string" minOccurs="0" maxOccurs="1" />
                                        <xs:element name="thumbnail" minOccurs="0" maxOccurs="1" type="xs:string" />
                                </xs:sequence>
                                <xs:attribute name="compression" type="xs:string" use="optional" />
                                <xs:attribute name="integrityCheck" type="xs:string" use="optional" />
                                <xs:attribute name="integrityCheckAlgorithm" type="xs:string" use="optional" default="SHA-1" />
                        </xs:extension>
                </xs:complexContent>
        </xs:complexType>

        <xs:complexType name="BIN" abstract="true" mixed="true">
                <xs:complexContent>
                        <xs:extension base="ANY">
                                <xs:attribute name="representation" use="optional" type="xs:string" default="TXT" />
                        </xs:extension>
                </xs:complexContent>
        </xs:complexType>

        <xs:complexType name="ANY" abstract="true">
                <xs:attribute name="nullFlavor" type="xs:string" use="optional" />
        </xs:complexType>
         
        <xs:element name="title" type="ST" />
</xs:schema>

Note that in the above I have mixed="true". Despite that, the generated schema fragment doesn't contain a reference to it, nor does the generated class use XmlMixed:

/**
 * <p>Java class for ST complex type.
 *
 * <p>The following schema fragment specifies the expected content contained within this class.
 *
 * <pre>
 * &lt;complexType name="ST">
 * &lt;complexContent>
 * &lt;restriction base="{urn:hl7-org:v3}ED">
 * &lt;sequence>
 * &lt;element name="reference" type="{http://www.w3.org/2001/XMLSchema}string" maxOccurs="0" minOccurs="0"/>
 * &lt;element name="thumbnail" type="{http://www.w3.org/2001/XMLSchema}string" maxOccurs="0" minOccurs="0"/>
 * &lt;/sequence>
 * &lt;/restriction>
 * &lt;/complexContent>
 * &lt;/complexType>
 * </pre>
 *
 */
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "ST")
public class ST
    extends ED
{
}

Why is XJC / JAXB completely disregarding my mixed content fields? I can't change the schema as the instance documents will come from many sources.

Thanks for any suggestions.

-- 
Kaleb Pederson
Blog - http://kalebpederson.com
Twitter - http://twitter.com/kalebpederson