Where is activiti:formKey="wf:activitiReviewTask" config evaluator?

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mangar

I am running through Jeff Pots custom workflow tutorial.  I sort of understand

   <config evaluator="string-compare" condition="activiti$helloWorldUI">

and I can configure the share form the way I like.  When I click start workflow,  It goes to the User Task,  and defines the model to use

activiti:formKey="wf:activitiReviewTask">

My question is where the Share form for this task defined? And how does Alfresco know to use that form for this user task?

sp2

This form key is defined in workflowModel.xml