How to copy the Dynamic fields into one field

[Radha C.]

Hi,
 
Can I have the dynamic field in copyField as follows,
 
<dynamicField name="*_i"  type="integer"    indexed="true"  stored="true"/>
 <dynamicField name="*_txt"  type="text"    indexed="true"  stored="true"/>
 
<copyField source="*_i" dest="all"/>
 <copyField source="*_txt" dest="all"/>
 
Can anyone tell me please how to make the dynamic field to be available in
one field "all" ?