Consider a map type of element that has a set of well known subelements along with support for custom elements. Can something like this work?
<xs:element name="descriptors">
<xs:annotation>
<xs:documentation>
The descriptors element contains all the descriptors for a containing element, as subelements.
The descriptors suggested in the jmx spec have predefined elements, whereas custom descriptors have
a generic element.
</xs:documentation>
<xs:appinfo>
<jbxb:class impl="javax.management.modelmbean.DescriptorSupport"/>
</xs:appinfo>
</xs:annotation>
<xs:complexType>
<xs:sequence>
<xs:element minOccurs="0" ref="xmbean:interceptors">
<xs:annotation>
<xs:appinfo>
<putMethod name="setField"
keyType="java.lang.String" valueType="java.lang.Object" />
<mapEntry />
<mapEntryKey key="interceptors" />
<mapEntryValue />
</xs:appinfo>
</xs:annotation>
</xs:element>
<xs:element minOccurs="0" ref="xmbean:persistence">
<xs:annotation>
<xs:appinfo>
<putMethod name="setField"
keyType="java.lang.String" valueType="java.lang.Object" />
<mapEntry />
<mapEntryKey key="persistence" />
<mapEntryValue />
</xs:appinfo>
</xs:annotation>
</xs:element>
...
This says the descriptors/interceptors element value should be added to the javax.management.modelmbean.DescriptorSupport corresponding to the descriptors element using the setField(String, Object) method with a fixed key of "interceptors" and the value being the binding for the interceptors element.
