The semantic object data model defined by the album includes {TAIL ~ one or more semantic objects}, {HEAD ~ each} of which includes one or more attributes that define a characteristic of the semantic objects 
The semantic object data model defined by the album includes { TAIL ~ one or more semantic objects } , { HEAD ~ each } of which includes one or more attributes that define a characteristic of the semantic objects
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH