getCellValueRef - Reading of data from individual xls file cells.

XML request, sent by the client to the server

<protocol>
     <xtra sid="10">
          <data name="testXLS" function="getCellValueRef">
               <request>
                     <xls sheet="1" cell="A1"/>
                     <xls sheet="1" cell="B8"/>
               </request>
          </data>
     </xtra>
</protocol>

Sheet represents a number of sheet in the xls file, we want to work with.
Cell is the cell that we want to read values from.

XML response of the server to the client

<protocol>
     <response action="xtra" errorCode="0" sid="10">
         <data name="testXLS" function="getCellValueRef">
            <result state="ok">
                <xls sheet="1" cell="A1"><![CDATA[value1]]></xls>
                <xls sheet="1" cell="B8"><![CDATA[value2]]></xls>
            </result>
         </data>
     </response>
</protocol>

The contents of the cells is returned in UTF-8.