Description of problem:

Draft Mrg Msg User's guide 2.0 -> Chapter 2 -> Exchanges:  declares there are four, but lists five:

<begin>

In MRG Messaging there are four standard exchange types and a custom exchange type:
AMQP 0-10 Exchange Types

    *
      Fanout
    *
      Direct
    *
      Default
    *
      Topic
    *
      Headers
    *
      XML Exchange (A Custom Exchange) 
<end>