Here is the XML node of the query template that defines rule and GU (see Template Query):

<Templates>
 <Template Name="Activity" >
  <Messages>
	  <Exists>Must have an activity.</Exists>
	  <NotExists>Should not have active activity.</NotExists>
	  <Cardinality>Number of activities should be correct.</Cardinality>
  </Messages>
  <Source>
   <From>
      CONTACT_CATEGORIES
   </From>
   <WhereFields>
      <MapField Name="Contact_Number" Type="Integer" />
      <ValueField Name="Valid_To" Condition="&lt;"  Value="[Now]" Type="Date" />
      <ValueField Name="Activity" Condition="=" Attribute="Activity" Type="Varchar" >
	   <Control Caption="Activity:" Type="Combobox">
		<Source>
		   <SelectFields>
			<ValueField Name="Activity" />
			<Field Name="Activity_Desc" />
		   </SelectFields>
		   <From>ACTIVITIES</From>
		 </Source>
		</Control>
       </ValueField>
      <ValueField Name ="Activity_Value" Condition="=" Attribute ="Activity_Value" Type="Varchar" >
	    <Control Caption="Value:" Type="Combobox">
		  <Source>
			<SelectFields>
			  <ValueField Name="Activity_Value" />
			  <Field Name="Activity_Value_Desc" />
			</SelectFields>
			<From>ACTIVITY_VALUES</From>
			<WhereFields>
			  <ValueField Name="Activity" Condition="=" Attribute="Activity" Type="Varchar" />
			</WhereFields>
		  </Source>
	    </Control>
      </ValueField>
   </WhereFields>
  </Source>
 </Template>
</Templates>