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