recursive function?

A simple version of my Xml looks like this;

<Result>

<Person>
 <Name>Pete</Name>
 <City>New York</City>
</Person>

<Person>
 <Name>Tom</Name>
 <City>Chicago</City>
</Person>

<Person>
 <Name>Lisa</Name>
</Person>

<Person>
 <Name>Bart</Name>
</Person>

</Result>


I would like mye page to look something like this:

Pete - New York
Tom - Chicago

People not connected to city:
Lisa
Bart


In my for-each Person loop I know i can check if City exists and if not 
write the line "People not  connected to city:". But how can I do this only 
once - before the first person not having a City node? (The ones without 
City will always come last in the listing). I guess I will have to use a 
recursive funcion, but how will this work when I'm using the for-each 
looping through the records?
Thanks

Tore

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