select attribute and save

Hello to everyone,
I want to save in differents txt files some comments which are in an excel file. I use the operator "read excel" , "select attribute" , "write as a text" .
My code is:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<process version="5.1.008">
  <context>
    <input/>
    <output/>
    <macros/>
  </context>
  <operator activated="true" class="process" compatibility="5.1.008" expanded="true" name="Process">
    <parameter key="encoding" value="UTF-8"/>
    <parameter key="parallelize_main_process" value="true"/>
    <process expanded="true" height="280" width="547">
      <operator activated="true" class="read_excel" compatibility="5.1.008" expanded="true" height="60" name="Read Excel" width="90" x="65" y="66">
        <parameter key="excel_file" value="C:\Users\elenious\Desktop\diplomatiki\newresults\ypes_comments_98.xls"/>
        <parameter key="imported_cell_range" value="G1:G1362"/>
        <parameter key="first_row_as_names" value="false"/>
        <list key="annotations">
          <parameter key="0" value="Name"/>
        </list>
        <list key="data_set_meta_data_information">
          <parameter key="0" value="Σχόλιο.true.polynominal.attribute"/>
        </list>
      </operator>
      <operator activated="true" class="select_attributes" compatibility="5.1.008" expanded="true" height="76" name="Select Attributes" width="90" x="246" y="75">
        <parameter key="attribute_filter_type" value="single"/>
        <parameter key="attribute" value="Σχόλιο"/>
        <parameter key="attributes" value="|Σχόλιο"/>
        <parameter key="value_type" value="text"/>
        <parameter key="include_special_attributes" value="true"/>
      </operator>
      <operator activated="true" class="write_as_text" compatibility="5.1.008" expanded="true" height="76" name="Write as Text" width="90" x="447" y="210">
        <parameter key="result_file" value="C:\Users\elenious\Desktop\asbeo comte\comments_%{a}.txt"/>
        <parameter key="encoding" value="UTF-8"/>
      </operator>
      <connect from_op="Read Excel" from_port="output" to_op="Select Attributes" to_port="example set input"/>
      <connect from_op="Select Attributes" from_port="example set output" to_op="Write as Text" to_port="input 1"/>
      <connect from_op="Write as Text" from_port="input 1" to_port="result 1"/>
      <portSpacing port="source_input 1" spacing="0"/>
      <portSpacing port="sink_result 1" spacing="0"/>
      <portSpacing port="sink_result 2" spacing="0"/>
    </process>
  </operator>
</process>

As a result i take one txt file with all the comments.What i must to do to save the comments in differents files?

Thanks!!!