Re: OpenVMS and XML questions
From: Spud Demon (spud_demon_at_e.thundermaker.net)
Date: 06/22/05
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Date: Wed, 22 Jun 2005 12:09:24 GMT
"tadamsmar" <tadamsmar@yahoo.com> writes in article <1119286539.558160.164080@g14g2000cwa.googlegroups.com> dated 20 Jun 2005 09:55:39 -0700:
>The application currently uses a serial interface to read/write the
>data points, but we are exploring using the XML interface that the
>environmental control system provides.
XML is a data representation protocol, not a communications protocol. XML
cannot replace your existing layer-0 (the serial line).
Maybe you mean RSS over TCP/IP?
>I figure I could read/writh the XML via Java and transfer it to the
>legacy application via files. That would probably work for us, but I
>would like to explore my options.
The java JVM startup on VMS is sloooooow -- several seconds to run "hello
world". Also, the Java XML implementations are pretty huge themselves.
There is a port of Expat on VMS. It's fast and efficient, and you can call
it from C or any other compiled language on VMS that can implement the
required callback routine. But that will only address parsing your data,
not how it gets from PC to VMS.
--Spud Demon spud_demon -at- thundermaker.net
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