parser for xml-data?

Ron Bourret rbourret at
Fri May 8 14:51:52 BST 1998

Sudarshan Purohit wrote:

> > By the way, there was a question the other day about how one might actually
> > deploy XML-Data as a substitute for a DTD.  Was this ever answered?
>    I don't think so. What I'm doing at the moment is ignoring any other schema
> that appears in the data file itself. So in a sense, I'm actually using the
> XML-Data file as a DTD. I'm also not yet clear on whether and how the data 
> refers to the schema. In my program the user will have to specify them both.

One possibility is that something in your XML document, such as an attribute at 
the root, would refer to the XML document containing the XML-Data definition of 
your grammar:

<MyRoot Schema="MyRootSchema.xml">

Another (uglier) possibility is that you use namespaces: the XML-Data namespace 
and the namespace your XML-Data data defines.  I haven't looked enough at either 
the namespaces or XML-Data specs to be sure how this would work, but it seems 
the object structure might be something like:

Root object
   XML-Data root
      XML-data data...
   Your data root
      Your data...

In either case, a validating parser would need to know that it used the XML-Data 
schema to validate the XML-Data object and the schema defined by the XML-Data 
data to validate your object, which is essentially what you're doing.

Any hints from the XML-Data folks?

-- Ron Bourret

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