protected ConvertedRel tryConvert(PreConversionRel rel) {
        ConvertedRel convertedRel = null;
        for (WorkflowToRelConverter workflowToRelConverter : workflowToRelConverters) {
            if (convertedRel == null) {
                convertedRel = workflowToRelConverter.convertToRel(rel);
            } else {
                convertedRel = workflowToRelConverter.convertToRel(convertedRel);
            }
        }
        return convertedRel;
    }
convert dss workflow to real schedule system workflow
@param rel dss workflow
@return real schedule system workflow
dss-orchestrator/orchestrators/dss-workflow/dss-workflow-conversion-standard/src/main/java/com/webank/wedatasphere/dss/workflow/conversion/operation/AbstractDSSToRelConversionOperation.java