[typedevent] Clarify implementation support for event types
As discussed in implementations may support a broader set of types, but not portably.
methods, all static fields, and any non public instance fields of an event object must be
ignored by the Typed Event Service when processing the Event data.</para>
+ <para>Some implementations of the Typed Event Service may support Type Safe Event classes
+ that do not conform to the DTO rules, transforming them as needed in an implementation
+ specific way. This is permitted by this specification, however consumers which rely on
+ this behaviour may not be portable between different implementations of this specification.
+ </para>
+
<section>
<title>Nested Data Structures</title>
<para>OSGi DTOs are permitted to have data values which are also DTOs, allowing nested data
