Martijn Tonies wrote:

>
>>>Not entirely. It doesn't tell you anything about physical storage,
>>>it does tell you about what should be stored (namely: "true"
>>>values).
>>
>>...from the point of view of the relational model. Do you want to
>>claim that the true values in relational model are the only true
>>values that can exist?

cut

> Don't take me wrong -- I find XML useful for all sorts of things.
>
> But not for persistent largish data storage systems.

I agree there is no data model in xml (it's a document centric language )

The design goals for XML are:
XML shall be straightforwardly usable over the
Internet.
XML shall support a wide variety of applications.
XML shall be compatible with SGML.
It shall be easy to write programs which process XML
documents.
The number of optional features in XML is to be kept to the
absolute minimum, ideally zero.
XML documents should be human-legible and reasonably
clear.
The XML design should be prepared quickly.
The design of XML shall be formal and concise.
XML documents shall be easy to create.
Terseness in XML markup is of minimal importance.