Updated definition of "same as" operator based on implementation feedback.
Updated definition of "same as" operator based on implementation feedback.

wanghaisheng/clinical_quality_language-Research,DBCG/cql_engine,cqframework/clinical_quality_language,MeasureAuthoringTool/clinical_quality_language,MeasureAuthoringTool/clinical_quality_language,wanghaisheng/clinical_quality_language-Research,MeasureAuthoringTool/clinical_quality_language,MeasureAuthoringTool/clinical_quality_language,DBCG/cql_engine,cqframework/clinical_quality_language,wanghaisheng/clinical_quality_language-Research