How can i use one datatable inside the other?

Hi all,
i need help ... i have this page that shows information from a relational table... for example a mapped table "Countries" that has a java.util.Set inside named "Cities" and i would like 2 know how can i do this using jsf...
The display would be like this:
Brasil
Rio de Janeiro
Sao Paulo
USA
New York
Washington
New Orleans
And Goes on... So i guess it would be a dataTable inside the other, right? but i dunno how to do it...
Thanks for any info. cya

this is somehow a messy example. But just focus on the var attribute of outer datatable and how value attribute of inner datatable is referencing it.
<h:dataTable id="table1" value="#{pc_City_state.listofstates.states}" var="varstates" styleClass="dataTable">
               <h:column id="column1">
                    <f:facet name="header">
                         <h:outputText styleClass="outputText" value="StateName" id="text2"></h:outputText>
                    </f:facet>
                    <h:outputText id="text3" value="#{varstates.stateName}" styleClass="outputText">
                    </h:outputText>
               </h:column>
               <h:column id="column3">
<f:facet name="header">
</f:facet>
          <h:dataTable id="table2" value="#{varstates.cities}" var="varcities" styleClass="dataTable">
                                   <f:facet name="footer">
                                   </f:facet>
                                   <h:column id="column4">
          <f:facet name="header">
          <h:outputText styleClass="outputText" value="CityName" id="text6"></h:outputText>
          </f:facet>
          <h:outputText id="text7" value="#{varcities.cityName}" styleClass="outputText">
          </h:outputText></h:column>
          </h:dataTable>
</h:column>
</h:dataTable>

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