rules from an xml file

[jonny]

I have a python code that manages some parameters using some variable
rules that may change from day to day. I'd like that the code will
self-modify according to rules parsed from a xml file:

example:

<rules>
   <rule01>
      <if>
                <or>
                        <lessthan par_1="glicemyAtMorning" par_2="80"/>
                        <lessthan par_1="glicemyAtNight" par_2="80"/>
                        <and>
                                <greaterthan par_1="glicemyAtMorning" 
par_2="0"/>
                                <or>
                                        <equalto par_1="urine" par_2="0"/>
                                        <equalto par_1="urine" par_2="+/-"/>
                                        <equalto par_1="urine" par_2="+"/>
                                </or>
                        </and>
                </or>
        </if>
        <then>
           <sendmessage>Something is wrong!</sendmessage>
        </then>
   </rule01>
   <rule02> ...  </rule02>
   <rule03> ...   </rule03>
</rules>

Due to the fact that rules may change, I have to manage the python
program, parsing the whole xml file, and self-modify the python code
according to these variable rules.
How can I do?

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