problems using the pphash "set"

hello!
I needed your help regarding the pphash "set".
It is mentioned that we can change the values present in a writable Hash 
with this command. Now it seems to work for the case when we want to change 
the value of the first hierarchical element. Let me give u an example and 
explain the problem. I have stored an element (which itself is a hash) from 
XML file into a writable hash using this pphash "set".

<pp.set hash=Hash key="Syntax" value=node.syntax />

The structure of this "syntax" element (from node) in the XML file looks 
like :

<syntax>
            <typedef basetype="Enumeration">
                        <namednumber name="sonet" number="1"/>
                        <namednumber name="sdh" number="2"/>
            </typedef>
</syntax>

As you can see that there are a few attributes present. Now I want to change 
the values of these attributes. I have tried giving different values in the 
"key" parameter e.g. key="Hash.Syntax.typdef.@basetype"
and giving the value that i want, in the value parameter, but it doesnt 
work. When i print the value using the "pp.warning", it gives the original 
values that were stored when i used the first set command to save the 
node.syntax.

I am really getting desperate regarding this problem, i know there is a way 
to change the values but i cannot seem to figure out how.
I would really appreciate if you can email me the solution to this problem.
Thanking in Anticipation.

Best Regards
Asadullah Khan Niazi

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