XML & ordered lists

In my quest to get a better handle on understanding XML,
I have run across a slight problem.

I am trying to create an ordered list, but the list fails
to display as expected (type and incrementing).

Here is a snippet from the dtd:

   <!ELEMENT directions (step+)>
   <!ATTLIST step 
       optional CDATA #IMPLIED>
   <!ELEMENT step (#PCDATA)>
--------------------------------------------
Here is a snippet from the .css

directions {display:block;}
step {display:list-item;font-size:12px;list-style-type:upper-roman}
---------------------------------------------
Here is some XML:

<directions>
<step>Do this</step>
<step>Do that</step>
</directions>
---------------------------------------------
Here is what I expect:

I Do this
II Do that
---------------------------------------------

What actually displays is a circular bullet for each step.
The type of list item and the fact that it does not increment
is not working as expected. Am I missing something simple
or expecting too much?

-M
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