yep, as follows:

  <profile enabled="true">
   <properties>
    <add name="FirstName" type="System.String"/>
    <add name="LastName" type="System.String"/>
           <add name="Telephone" type="System.String"/>
           <group name="Address">
             <add name="Street" type="string"/>
             <add name="City" type="string"/>
             <add name="County" type="string"/>
             <add name="PostCode" type="string"/>
           </group>
           <add name="MemberId" defaultValue="0" type="System.Int32"/>
    <group name="Core"/>
   </properties>
  </profile>