{HEAD ~ Each info object} may have characteristics with attributes, {TAIL ~ texts}, or hierarchies, and may function as a data source 
{ HEAD ~ Each info object } may have characteristics with attributes , { TAIL ~ texts } , or hierarchies , and may function as a data source
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH