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Re: processing XML in protocol messages

• To: <xml-dev@l...>
• Subject: Re: processing XML in protocol messages
• From: Joel Bender <jjb5@c...>
• Date: Sat, 9 Nov 2002 12:12:35 -0500
• In-reply-to: <OMEBKBLDIIHBJOCOOPOIKEENCAAA.bhcheng@a...>
• References: <OMEBKBLDIIHBJOCOOPOIKEENCAAA.bhcheng@a...>

>Do people write program to compose protocol messages in XML 
>(probably DTD as well), send to the other end, and then the receiver 
>uses an XML parser to get a DOM structure from the message, and 
>access the message data through the DOM structure?

It can be easier.

Open a TCP stream between the two processes and attach SAX parsers to 
them.  Have the two notify their peer what kinds of messages they are 
going to be sending:

      <?xml version="1.0"?>
      <MyChat>

Each message is simply an element:

      <Message priority="1">Yo!</Message>

And when you're done sending, close the "document":

      </MyChat>

Then close the stream.  You'll get element events from the parser. 
If you're happier with pull parsers, you can use them as well.

>This is kind of big overhead and people who want to use XML as their message
>encapsulation need to understand XML first.

They need to know very little about XML.  Layers of structures and 
tools and schemas make it overly complicated.


Joel

-- 

• References:
  • processing XML in protocol messages
    • From: "Bing-huang Cheng" <bhcheng@a...>

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