Corba data -> XML

John Cowan cowan at
Wed Sep 23 17:24:53 BST 1998

Thillai wrote:

> I know only little bit about XML.  I like to know whether a CORBA operation
> can be expressed in XML document type definition?

You got lots of answers to the question "How to do Corba-style stuff
by exchanging XML documents", but that isn't really what you asked.

> For example if the IDL has something like
> interface z
> {
>         typedef sequence<String, 5>  t1;
>         void x(in int p1,  in t1 p2);
> }
> and I want to store the parameters for the operation in a file.
> I like to have a XML data file like
> <interface>
> z
> <operation>
> x
> <inparameter>
> <param>
> p1
> <value>10</value>
> </param>
> <param>
> p2
> <value><nelems>5</nelems><0>abc</0><1>efg</1><2>hij</2><3>
> klm</3><4>nop</4></value>
> </param>
> </inparameter>
> </operation>
> </interface>
> If there is no maximum limit for the type t1 then no. of elements in the
> sequence might vary.

The tags <0>, <1> etc. are not valid XML, because an element name can't
be numeric.  You could use _0, _1, etc. but really all you need is
just "<value><component>abc</component><component>efg</component> ...",
with no need to specify an explicit count (XML processors are expected
to be able to count things).

> For this file is it possible to write DTD.  (I will read about DTD and find.
> Before that any expert comment will be helpful)

Yes, no problem.
> If it is possible then is it possible to write XSL for getting values from the
> user.  (no. of elements in the sequence might vary at runtime).

I don't really see how.  XSL is for styling XML for display.

John Cowan		cowan at
	You tollerday donsk?  N.  You tolkatiff scowegian?  Nn.
	You spigotty anglease?  Nnn.  You phonio saxo?  Nnnn.
		Clear all so!  'Tis a Jute.... (Finnegans Wake 16.5)

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