Nesting elements

Hi all,
First post to the list, I just hope it's not too obvious a question...

I'm trying to build a DTD for passing order information to a web site
partner and have some questions about their proposed XML format.

They have a top level order element which can contain one or more product
elements, along with invoice and delivery addresses.

The product if a photograph and so could (optionally) have a frame, etc.

Now the other developer I'm dealing with has proposed that all 'items' are
products (so a photo is a product, a frame is a product, the nail to hang it
on is a product, etc).

Can I define an element called product which can include other instances of
itself?

<!ELEMENT product (description, quantity, price, product)>

So I end up with XML like...
<order>
    <product type="photo">
        <description>A photograph</description>
        <product type="frame">
            <description>A metal frame</description>
        </product>
    </product>
</order>

Can I do this and do I need to do anything special when defining the product
element?

With thanks,

____________________________
Mark Stradling
Cold Fusion Developer

Blueberry.Net
Creating Fruitful eBusiness
www.blueberry.net
____________________________

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