> 3)       There has been some concern over the limit of 255 custom extension 
> message per PEN.  We don't forsee this as a problem in the short term, but 
> want to leave space for LTK structured extensions beyond 255.  We'd like to 
> have the LTK reserve subtype 255 for future extensions.  This would mean that 
> libraries would have to error-out when producing code for any custom 
> extension that tries to use the 255 subtype.
>

To clarify, you wouldn't error out when serializing or deserializing
any messages. If LTK doesn't know how to decode a Custom, it will
generate a Custom Message or Custom parameter with a hex BLOB.

The error-out would occur while processing a *def.xml file. For Perl,
this is processed in order to build a data structure in memory. For
all other current LTK implementations, this is during code generation
phase.

Because of this, this restriction wouldn't affect any extension
authors not conforming to LTK Structured Extension format, since there
is not likely to be a *def.xml file that would describe their
extensions anyway.

-- John.

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