I wanted to convert my EMF model to an XText Grammar to generate an editor for my model. However, the feature maps are not supported in XText. Therefore, it is best to remove them. As an XSD is the source of my EMF, i just annotated the xsd:choice constructs with ecore:featureMap=””. Then, XText can create the language.
Other problems arise due to datatypes. For the XML Datatypes, specific IValueConverters have to be registered.