DTD and Schema question

["Messineo, Chris" <CMessineo@xxxxxxxxx>]

We've been using a DTD for several months now and have been getting
questions by clients asking us to move to schema?  My question is this - Do
all parsers support schemas'?  Also they want us to use a schema to validate
one field that can be a float or NULL, don't know if using a schema
introduces any overhead.  
 
Any input would be appreciated.
 
Thanks


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