A powerful feature would be the ability to auto-generate GORM classes from an XML schema. This would (ideally) include all the gorm fields and relationships, and controller validation of element constraints (minOccurs, MaxOccurs, etc). I see this as an extension to the grails command syntax, e.g. 'grails create-domain-classes-from-xsd <url>' and scaffold controller/view generation. Support for marshalling/demarshalling to/from valid xml documents would also be beneficial. JAXB for Grails!