what is collection(COLL) and cid

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hi,all
look at the code.
case Transaction::OP_MKCOLL:
      {
             coll_t cid = i.get_cid();
      ...}
1 .
what is COLL and cid?  
is coll is a pg and cid is pgid?
 
2. what is the relation between cid and 'current/meta'?   or what is in current/meta?
 
 
thanks very much.
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