TheESRIMappingSpecificationforDWG/DXF(MSD)isamethodofcodinginformationinaDWGorDXFfiletodefineGISfeatureclasseswithnon-geometricattribution,andthedefinitionofageospatialcoordinatesystemrecognizedbyERSI'sArcGISsoftware.ThespecificationutilizesstandardDWG/DXF