Hi,
By "cross validate" I mean :
Lets
say Party1 provides an XML document to party2 and before that party1 sends the
corresponding XSD document to party2.
Then
how does party2 validate the given XML document ? There may be many
goofing things, Manual validation does not work for an XML document
containing 1000s of records.
Where
as, had it been in DTD, the parser would have validated the XML document[say IE
browser]. Because DTD is defined in same XML document itself and DTD itself is
not a separate doc as opposed to XSD.
That's
what my understanding is. Can you please correct me ?
Regards,
RNS
In terms of validation functionality, XSD can define all
the constraints that a DTD can define, and many more. To take a simple
example, XSD can say that a particular attribute must be a valid date, or a
number, or a list of URIs, or a string that is exactly 8 characters long. To
take another example, XSD can define much richer constraints on uniqueness of
values within a document.
I've no idea what you mean by "cross validate". I believe
the only things you can do with a DTD that you can't do with an XML Schema are
things that have nothing to do with validation: notably, defining
entities.
Michael Kay
Hello,
Can anybody please explain me the real difference between XSD
and DTD. Because both are used to define the schema of an XML
document.
Whereas DTD is more powerful in the sense that XML parser can cross
validate an XML document based on its DTD, and this is really useful in
business world as XML is mostly used to exchange the data between
parties.
On
the other hand XSD defines the schema in XML syntax only which is more
readable, but XML parser CAN NOT cross validate one XML document based on a
given XSD.
Then I am not understanding why people go for XSD
?
Can some body correct me please !
Thanks in advance,
Regards,
Rabindra Nath
Saha
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