The multimedia content may be layered using multiple different layering approaches simultaneously, and access to {HEAD ~ the different types} of {TAIL ~ layers} may be offered simultaneously 
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The multimedia content may be layered using multiple different layering approaches simultaneously , and access to { HEAD ~ the different types } of { TAIL ~ layers } may be offered simultaneously
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH