Possible to grab xml post data to create a product to add to cart?

hey ya'll, so I'm looking at different ways of implementing something...

I have a catalog I am able to retrieve product information from a website which when "add to cart" is clicked, on a particular product, it will send xml data via a FORM-POST to a url of my choosing. I can't seem to find out if it is possible to have zencart be able to utillize this xml data about the product, ie:

<Root>
	<Item basket_id=”number I create”>
		<ItemID>AAA</ItemID>
		<Description>Textual description</Description>
		<Quantity>Number</Quantity>
		<Price>Number</Price>
		<DimensionA>Usually a number</DimensionA>
		<DimensionB> Usually a number </ DimensionB>
	</Item>
</Root>

and add it to a basket/cart in zencart. From what I have been able to gather, the only items that are 'addable' to a cart in zencart are products created within the zencart software itself -- in other words, I believe I cannot use external (to zencart) data to add a product into a cart -- is that correct, or is this actually possible? (or is what I'm trying to do totally not clear, haha?)

Zen Cart works only with products in its database. It doesn't offer you the ability to create products out of thin air on-the-fly without adding them to the database first.

DrByte:

Zen Cart works only with products in its database. It doesn't offer you the ability to create products out of thin air on-the-fly without adding them to the database first.

ah, alright ,that's what I was thinking -- but just to be sure, you understand what I'm talking about, right? I retrieve the product information from POST by XML from a third party provider, and am trying to create a cart for these items.

Since zencart is not able to do this particular function, any suggestion of what could?

thanks for your help thus far!