SV: SKiCal extensibility

["Greg FitzPatrick" <greg.fitzpatrick@xxxxxxxxxxxxx>]

Good suggestion

Greg


Bruce:

Making sure that we learn a good lesson from iCalendar, I noticed that some
of the new property parameters (and possibly the properties) have very very
restrictive ABNFs  in that they do not allow for future expandability.  This
is not good.

For example, section 2.6  Qualification status parameter has:

     qualstatparam = "QUALRULE" "=" *1("REQUIRED" / "NOTREQUIRED" /
                    "RECOMMENDED" / "NOTRECOMMENDED" / "PROHIBITED" /
                    "NOTPROHIBITED")

(Please fold values to separate lines...) While this may appear OK at first
pass, it precludes any new values that are not expressly put in the ABNF.
The lesson from iCalendar would make the ABNF:

     qualstatparam = "QUALRULE" "=" *1("REQUIRED" / "NOTREQUIRED" /
                    "RECOMMENDED" / "NOTRECOMMENDED" / "PROHIBITED" /
                    "NOTPROHIBITED" / x-name / iana-token )

so that new values (or experimantal ones) can be added w/o breaking some
stricter interpretations!!

Bruce
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Bruce Kahn                                INet: Bruce_Kahn@xxxxxxxx
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