Typoscript 

The registered content element has to implement the DataflowProcessor.
Example for the CType html

Jar\Dataflow\DataProcessing\DataflowProcessor

Parameters **as** (string)*: Index of the processed data.
tt_content.html.DataProcessing {
   10 = Jar\Dataflow\DataProcessing\DataflowProcessor
   10 {
      as = items
   }
}
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