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From: Nimmi Srivastav on 18 Mar 2010 05:24
Greetings,

I have two newbie questions.

1) Using XML Schema, how can I describe an XML document in which the
root element is either A or B? Also, using DTD, how can the same be
achieved?

2) In an XML driven messaging system, is it a good design practice to
use XML documents with different root elements to indicate the message
version information? For example, the root element can be Ver1 or
Ver2. If the recipient receives XML content with root element Ver1,
it processes it as a version 1 message and if the recipient receives
XML content with root element Ver2, it processes it as a version 2
message. The structure of Ver1 message can be substantially different
from the structure of the Ver2 message.

Thanks,
Nimmi

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