xsd4gorm is a Grails plugin and standalone API that creates Grails Object Relational Mapping (GORM) classes for a Grails application or standalone GORM from a XML Schema Definition (XSD) document.

Grails command will be something like:

grails create-domain-classes-from-xsd XSDFile

Command line will be something like:

xsd4gorm -d "dir" -p "package" XSDFile

Note: xsd4gorm is in development and is not available as a download yet.