public override List <String> doRule(SQLPackage eaPackage, SQLWrapperClasses.SQLRepository sqlRepository)
        {
            List <String> results = new List <string>();

            if (eaPackage.Element != null && eaPackage.Element.Stereotype == TGGModelingMain.TggSchemaPackageStereotype)
            {
                TGG tggSchema = new TGG(sqlRepository, eaPackage);
                tggSchema.loadTreeFromTaggedValue();
                if (tggSchema.getDomain(DomainType.SOURCE) == null || tggSchema.getDomain(DomainType.TARGET) == null)
                {
                    results.Add("TGG source/target metamodel definition is invalid");
                }

                SQLPackage sourceMm = sqlRepository.GetPackageByGuid(tggSchema.getDomain(DomainType.SOURCE).MetamodelGuid);
                SQLPackage targetMm = sqlRepository.GetPackageByGuid(tggSchema.getDomain(DomainType.TARGET).MetamodelGuid);

                if (sourceMm == null || targetMm == null)
                {
                    results.Add("TGG source/target metamodel definition is invalid");
                }
            }
            return(results);
        }