what are rs: and z: and ows in xml node retrieved by sharepoint webservices
===

See the following code

    <listitems xmlns:s="uuid:BDC6E3F0-6DA3-11d1-A2A3-00AA00C14882" 
       xmlns:dt="uuid:C2F41010-65B3-11d1-A29F-00AA00C14882" 
       xmlns:rs="urn:schemas-microsoft-com:rowset" xmlns:z="#RowsetSchema" 
       xmlns="http://schemas.microsoft.com/sharepoint/soap/">
       <rs:data ItemCount="4">
          <z:row ows_Number_Field="6555.00000000000" 
             ows_Created="2003-06-18T03:41:09Z" 
             ows_ID="3" ows_owshiddenversion="3" />
          <z:row ows_Number_Field="78905456.0000000" 
             ows_Created="2003-06-18T17:15:58Z" 
             ows_ID="4" ows_owshiddenversion="2" />
             ...
       </rs:data>
    </listitems>

It has tags like **rs:** ,**z:** and property like **ows**.
Is there any proper names for these values?