Pulling v/s Pushing

"Nikhil C. Khedkar" <[email protected]>
Newsgroups gmane.text.xml.xmlpull.devel
Message-ID <[email protected]>
Hi all,
  Can you tell me the exact meaning of this pulling
mechanism used by the parser? What is pulling and
pushing? How do you comapre them, efficiencywise and
memory usage wise?
  Thanks,
     Nikhil

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