def fetch_flow_expression(workitem_or_fei)

      Ruote::Exp::FlowExpression.fetch(
        @context,
        Ruote::FlowExpressionId.extract_h(workitem_or_fei))
    end
def fetch_flow_expression(workitem_or_fei)

      Ruote::Exp::FlowExpression.fetch(
        @context,
        Ruote::FlowExpressionId.extract_h(workitem_or_fei))
    end
Convenience method, given a workitem or a fei, returns the
 corresponding flow expession.