How to copy attribute columns into new example set with the script operator

Dear community,

As a part of a larger script I am trying to copy selected attribute columns to a new example set.

Source example set:
label  att1   att2
1      a      1x
2      b      1y
3      c      1z

Target shall look like this (att2 copied from source):
att2
1x
1y
1z

My script looks currently like this:

import com.rapidminer.tools.Ontology;
exampleSet sourceTable = input[ 0 ];
exampleSet targetSet = new ExampleSet();
targetSet.addAttribute(sourceTable.getAttribute("att2"));
return targetSet;

Looking forward to any feedback...

PS: There are likely various ways to get from the original example set to the target one. But context of my whole script I am looking especially for a way to copy an attribute column.

PPS: By the way, is there any chance to access the values of macros in a script?


Best regards
Sachs

<?xml version="1.0" encoding="UTF-8"?><process version="7.5.000">
  <context>
    <input/>
    <output/>
    <macros/>
  </context>
  <operator activated="true" class="process" compatibility="7.5.000" expanded="true" name="Process">
    <process expanded="true">
      <operator activated="true" class="generate_data" compatibility="7.5.000" expanded="true" height="68" name="Generate Data" width="90" x="45" y="34"/>
      <operator activated="true" class="execute_script" compatibility="7.5.000" expanded="true" height="82" name="Execute Script" width="90" x="179" y="34">
        <parameter key="script" value="import com.rapidminer.tools.Ontology;&#10;exampleSet sourceTable = input[ 0 ];&#10;exampleSet targetSet = new ExampleSet();&#10;targetSet.addAttribute(sourceTable.getAttribute(&quot;att2&quot;));&#10;return targetSet;"/>
      </operator>
      <connect from_op="Generate Data" from_port="output" to_op="Execute Script" to_port="input 1"/>
      <connect from_op="Execute Script" from_port="output 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>