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I have a complex hierarchy of Java interfaces that I'd like to marshal (and not necessarily unmarshal) with JAXB. These interfaces represent objects that will be returned from a JAX-RS REST API as XML, JSON, YAML, etc. (I'm using RestEasy, which can marshal JAXB-annotated types in formats other than XML.) The problem seems to be that JAXB is fundamentally class-oriented. I've done lots of web research on the difficulties with JAXB and interfaces, the closest solutions being MOXy JAXB - Map Interfaces to XML and JAXB and Interface Fronted Models . However, I have two main issues: a) I want to annotate/work in terms of interfaces, not the concrete classes (of which there will be multiple implementations and containing significant other state that should not be marshaled), and b) I have multiple levels of interface inheritance. Here's a sample of the interfaces, minus any JAXB annotations so far: interface Uuided { UUID getId(); } interface Named { String getName(); } interface Component extends Uuided, Named { Map<String, ComponentAttribute> getAttributes(); } interface Attribute extends Named { Type getType(); Object getValue(); } interface ComponentAttribute extends Attribute { Component getDeclaringComponent(); } Ideally, this would generate something like: <component id="xxx" name="thing"> <attributes> <componentAttribute name="color"> <type><stringType/></type> <value>green</value> <declaringComponent idref="xxx"/> </componentAttribute> </attributes> </component> Clearly, in the abstract, this leads to issues like determining the most derived annotated interface, of which there could theoretically be m

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