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It is also possible to register named configurations. For example:

[source,groovy]
----
XML.createNamedConfig('publicApi') {
  it.registerObjectMarshaller(Book) { Book book, XML xml ->
    // do public API
  }
}
XML.createNamedConfig('adminApi') {
  it.registerObjectMarshaller(Book) { Book book, XML xml ->
    // do admin API
  }
}
----

Then when you use either the `render` or `respond` methods you can wrap the call in a named configuration if necessary to customize rendering per request:

[source,groovy]
----
XML.use( isAdmin ? 'adminApi' : 'publicApi') {
    render book as XML
}
----

or

[source,groovy]
----
XML.use( isAdmin ? 'adminApi' : 'publicApi') {
    respond book 
}
----