Streams, protocols, documents and fragments

[Matthew Sergeant (EML)]

> -----Original Message-----
> From:	Borden, Jonathan [SMTP:jborden at mediaone.net]
> 
> 
> 	Mark, I think it is just a simple implementation issue. We have XML
> parsers
> whose model is one XML document per stream (e.g. java inputStream). A
> multi-doc protocol can chop the stream into sub-streams to be passed to
> the
> XML parser. By employing an external delimiter, the protocol doesn't need
> to
> understand or parse the XML itself in order to detect "end-of-doc" even
> though the logical information is there. Otherwise the protocol
> implementation needs to understand XML syntax in order to detect
> "end-of-doc"
> 
> 
Perl's XML::Parser (and by logic I assume this comes from expat) already
does this - you can attach an IO handle (which can be an IO::Socket if you
want it to come from a socket) to the XML parser, tell it what the stream
delimiter is (e.g. ^L) and leave it merrily parsing XML. You have to tell it
to parse again when it stops, because that's how it says "I've reached the
end of one stream" - but it works fine. This is probably true of other
languages that use expat to parse XML for them.

Matt.
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