{TAIL ~ The system} allows a user to create a semantic object data model of {HEAD ~ the database schema} 
{ TAIL ~ The system } allows a user to create a semantic object data model of { HEAD ~ the database schema }
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD