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Re: Push and Pull?

• To: "Sterin, Ilya" <Isterin@c...>
• Subject: Re: Push and Pull?
• From: "Clark C . Evans" <cce@c...>
• Date: Fri, 25 Jan 2002 14:01:20 -0500
• Cc: xml-dev@l...
• In-reply-to: <15977008ABB8D5118B1300805FA7A8F1815A9F@c...>; from Isterin@c... on Fri, Jan 25, 2002 at 11:29:51AM -0700
• References: <15977008ABB8D5118B1300805FA7A8F1815A9F@c...>
• User-agent: Mutt/1.2.5i

On Fri, Jan 25, 2002 at 11:29:51AM -0700, Sterin, Ilya wrote:
| >In SAX, the parser is has the
| >control loop and thus this makes SAX parsers easy to write.  In
| >DOM the control loop is owned by the library's user.
| 
| That said, it again brings us down to that SAX parsers all (most)
| follow the push model, and DOM based follow the pull model. 

DOM [1] uses a random-access,     pull-flow-control interface.
SAX [2] uses a sequential-access, push-flow-control interface.
XPP [3] uses a sequential-access, pull-flow-control interface.

| > I've only just begun playing with random access push 
| > models... this is more or less events that can be replayed
| 
| For the push model to be replayed, probably means that it 
| will have to keep a parts in memory, or reparse all over again? 

Yes.  To offer random access an interface will probably elect
to keep an in-memory representation.  Although a random access
interface could be done over a database (see Tamino), etc.

| This means that we are back to in memory parsers right, or is 
| there some other concept behind it?

Right.  The examples above give you 3 permutations, one
could develop an interface which used random-access but
push-flow-control.  I started to put together an interface
for this about a year back... it had a way for events
to be "re-played".   I stopped after I didn't see an 
obvious application of the technique.   

;) Clark

[1] http://www.w3.org/DOM/
[2] http://www.saxproject.org/
[1] http://www.extreme.indiana.edu/soap/xpp/

-- 
Clark C. Evans                   Axista, Inc.
http://www.axista.com            800.926.5525
XCOLLA Collaborative Project Management Software

• Follow-Ups:
  • Re: Push and Pull?
    • From: "Nicolas Lehuen" <nicolas.lehuen@u...>
  • Re: Push and Pull? (Random vs Sequential) (Hierarchical vs Nested)
    • From: "Clark C . Evans" <cce@c...>

• References:
  • RE: Push and Pull?
    • From: "Sterin, Ilya" <Isterin@c...>

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