{HEAD ~ Rule R3} instructs the mashup that for a customer meeting with {TAIL ~ Sam}, fetch Sams most favorite web bookmarks 
{ HEAD ~ Rule R3 } instructs the mashup that for a customer meeting with { TAIL ~ Sam } , fetch Sams most favorite web bookmarks
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH