I try to edit a datable built from a list of String

This code does not work (silently without an Exception):

<rich:dataTable
 value="#{test.listString}"
 var="string"
 >
 <h:column>
 <h:inputText value="#{string}" />
 </h:column>
 </rich:dataTable>

Where listString is a List of String
Probably the EL expression #{string} is not a l-value or the string is not mutable.

But this code works perfectly well:

<rich:dataTable
 value="#{test.listString}"
 rowKeyVar="key"
 >
 <h:column>
 <h:inputText value="#{test.listString[key]}" />
 </h:column>
 </rich:dataTable>

With this trick I can edit directly a list of String obtained from a bean. Before having discovered this trick I had to build a list of rows, every row containing one String.
May be this trick can be useful for somebody