JAXB "is property set" method object
Defining a default value in the schema does not come through as a default value in the generated objects. This could be worked around if you could check for when a field has been explicitly set in the XML (as opposed the value being returned by the
is) method being the default).
Along the lines of past post - Getting xs:any as DOM object
You simply add another custom binding property:
<xs:appinfo> <jaxb:property generateIsSetMethod="true"/> </xs:appinfo>
This post has the snippet: How do you pick up default values from XSD/JAXB
Reasonable summary of Customizing JAXB Bindings (though not that easy to read): Customizing JAXB Bindings.