"Parameter macro process_path"

I can´t get the path of a process with the %{process_path}.

If I modify the 01_DecisionTree.xml with a reference in the log file I get an error
Cannot create log file: java.io.FileNotFoundException: C:\rmws\Sample\02_Learner\01_DecisionTree.xml\kk.log
The name and extension of the experiment is included. The same is obtained using process_name macro.

Can be used the macros in the root node?
Is there  any other macro for the path?

Thanks in advance.

F.J. Cuberos

<operator name="Root" class="Process" expanded="yes">
    <description text="#ylt#table#ygt##ylt#tr#ygt##ylt#td#ygt##ylt#p#ygt#This experiment starts with loading the data. 
...
RuleLearner.#ylt#/i#ygt##ylt#/td#ygt##ylt#/tr#ygt##ylt#/table#ygt##ylt#/li#ygt##ylt#/ul#ygt#"/>
    <parameter key="logfile"	value="%{process_path}\kk.log"/>
    <parameter key="logverbosity"	value="all"/>
    <operator name="Input" class="ExampleSource">
        <parameter key="attributes"	value="../data/golf.aml"/>
    </operator>
    <operator name="DecisionTree" class="DecisionTree">
    </operator>
</operator>