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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
http://www.saxonica.com/
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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