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  2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Encapsulation  \En*cap`su*la"tion\,  n.  (Physiol.) 
  The  act  of  inclosing  in  a  capsule;  the  growth  of  a  membrane 
  around  (any  part)  so  as  to  inclose  it  in  a  capsule. 
 
  From  The  Free  On-line  Dictionary  of  Computing  (13  Mar  01)  [foldoc]: 
 
  encapsulation 
 
  1.  The  technique  used  by  layered  protocols  in  which  a  layer 
  adds  header  information  to  the  protocol  data  unit  (PDU)  from 
  the  layer  above.  As  an  example,  in  Internet  terminology,  a 
  packet  would  contain  a  header  from  the  physical  layer, 
  followed  by  a  header  from  the  network  layer  (IP),  followed  by 
  a  header  from  the  transport  layer  (TCP),  followed  by  the 
  application  protocol  data. 
 
  2.  The  ability  to  provide  users  with  a  well-defined  interface 
  to  a  set  of  functions  in  a  way  which  hides  their  internal 
  workings.  In  {object-oriented  programming},  the  technique  of 
  keeping  together  data  structures  and  the  methods  (procedures) 
  which  act  on  them 
 
  (1998-09-07) 
 
 

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