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The signature of the execution string depends on the command that is launched. But the general rule is that input/output data and attributes have prefix $. You can set the parameterized description for the new element (the description that appears not in property editor but on the element itself). In the parameterized description, you also can use parameters substitution with prefix $. If the paths in the execution string contain spaces, they must be enclosed with quotes.

On the next wizard page, you can optionally input the description of the element. It would be shown on the element on the Scene. The description can be parameterized. This means that if you input e.g. an attribute name (with prefix $), the name on the element would be substituted with the value of the corresponding parameter. For example input the following parameters:

<center>
  <br>
  <img src="/wiki/download/attachments/24740125/Creating Element_4.jpg"/>
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</center>

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On the next wizard page, you can see the final element summary:

<center>
  <br>
  <img src="/wiki/download/attachments/209719924740125/create_elt_cmd_p4_filled.pngCreating Element_5.jpg"/>
  <br> 
</center>

The element created looks as follows:

<center>
  <img src="/wiki/download/attachments/209719924740125/elt_cmd_on_sceneCreating Element_6.png"/>
</center>