private static NewDocumentType.Name buildTypeName(String documentName) {
        String typeName = "Reference<" + documentName + ">";
        return new NewDocumentType.Name(typeName);
    }
Model for ReferenceDataType which is more suitable when
we want to end up with NewDocumentType as target type.

@author arnej
config-model/src/main/java/com/yahoo/documentmodel/NewDocumentReferenceDataType.java