Generating DTD's from an existing DB schema

Question

We have an existing schema defined by a large number of table creates. We need our messaging infrastructure to be in XML.
Use of the Oracle XDK and associated tools and components looks very promising for the problem before us. We are faced with writing the required XSQL, XSLT and "INSTEAD OF" triggers etc. of course ..... but my question is this: Is there a utility or product that can scan out schema definitions and generate a reasonable set of matching DTD's that would define nested elements taking account of the associated one-to-many relationaships in our schema? Or are we bound to do this also by hand?
Here is a trivial example:
+++++++++++++++++++
drop table Account;
drop table AcctUser;
create table Account (
accName varchar ( 50 ) primary key,
description varchar ( 255 )
create table AcctUser (
userName varchar ( 255 ),
acctID varchar ( 50 ),
foreign key (acctID) references Account( accName ),
description varchar( 255 )
++++++++++++++++++++
would be run though such a tool and
give us something like the following:
<!ELEMENT Account (User+)>
<!ATTLIST Account accName CDATA #REQUIRED
description CDATA #IMPLIED >
<!ELEMENT AcctUser EMPTY>
<!ATTLIST AcctUser userName CDATA #REQUIRED
description CDATA #IMPLIED >
++++++++++++++++++++++++++++++++
Evan if we could get 90% of the way there
and then have to refine by hand, it would be a big win.
Does anyone know of such a beast?
Thanks,
-- Mike Berrow
-- InsureZone
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Answer 1

Ooops ... of course, I meant ....
<!ELEMENT Account (AcctUser +)>
<!ATTLIST Account accName CDATA #REQUIRED
description CDATA #IMPLIED >
<!ELEMENT AcctUser EMPTY>
<!ATTLIST AcctUser userName CDATA #REQUIRED
description CDATA #IMPLIED >
-- Mike Berrow
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