counting items

[mok <cmok@xxxxxxxx>]

I have a problem with counting items.
In the example below, I would like to compose
with the following rules

1. (element SUBSTEP ITEM)
   no prefix
2. (element STEP ITEM)
   prefixed with (n + 1) where n is
   the num-of-times ITEM has occurred already
   occured as direct child of STEP

would anyone be able to advise me on this?

SGML:
-----

<STEP>
	<ITEM>Item One</ITEM>
	<ITEM>Item Two</ITEM>
	<SUBSTEP>
		<ITEM>Subitem</ITEM>
		<ITEM>Subitem</ITEM>
	</SUBSTEP>
</STEP>
<CONTAINER>
	<STEP>
		<ITEM>Item Three</ITEM>
		<ITEM>Item Four</ITEM>
		<SUBSTEP>
			<ITEM>Subitem</ITEM>
			<ITEM>Subitem</ITEM>
		</SUBSTEP>
	</STEP>
</CONTAINER>

SHOULD BE COMPOSED AS SUCH
--------------------------

1. Item One
2. Item Two
Subitem
Subitem
3. Item Three
4. Item Four
Subitem
Subitem


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