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