DMNFTF — Boxed Invocation has sparse references after definition

Boxed Invocation is defined in Ch7.2.3. In Ch8 Decision Table "builds on" Ch7 but has no reference to Boxed Invocation (e.g. while one might expect a reference with regard to invocation of Decision Tables). Likewise Annex B refers to Decision services but has no reference to Boxed Invocations.

Example: an end-user defined a DRD and associated Decision Tables (to reflect BKMs) expected to have to define Boxed Invocations to represent the interface to Decision Tables.

Suggested solutions:
1. Either add an explanation that Boxed Invocations are conceptual and only relevant to FEEL, or add how they are represented when defining Decision Tables (Ch8) and in the DMN Example (Ch11) and Annex on Decision Services (Ann B).

2. Show the DMN XMI model for the DMN example relating the example to the metamodel concepts in preceding chapters including Boxed Invocations.

In order to make it more explicit which figures in clause 11 are boxed invocations, in 11.3, change 'invokes' to 'is a boxed invocation of'