2.7 Language Extensibility

[Patrick Durusau <patrick@durusau.net>]

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Greetings!

I am uncertain about the purpose of 2.7 Language Extensibility.

The list following "allows:" appears to repeat information that is
reported in 4.2 (Extensions).

And, it is followed by this paragraph:

*****
The specification differentiates between mandatory and optional
extensions (the section below explains the syntax used to declare
extensions). If a mandatory extension is used, a compliant
implementation MUST understand the extension. If an optional extension
is used, a compliant implementation MAY ignore the extension.
*****

The reference of: "...the section below..." is vague and should be
replace by 4.2 (Extensions), if you keep this paragraph.

However, as an illustration of the DRY (Don't repeat yourself),
consider the next sentence:

*****
If a mandatory extension is used, a compliant implementation MUST
understand the extension.
*****

That sounds rather hard to guarantee. That every implementation will
"understand" some arbitrary extension.

But, the precise rules of 4.2 (Extensions) say:

*****
If a TOSCA implementation does not support one or more of the
mandatory extensions, then the Definitions document MUST be rejected.
*****

Now that is a rule can be successfully applied by an application.
Don't understand, then reject.

BTW, if you do make Section 2 normative, realize that Section 2.7 (if
you retain it) will conflict (as presently written) with the language
of 4.3 (Extensions).

Hope everyone is having a great day!

Patrick

- -- 
Patrick Durusau
patrick@durusau.net
Technical Advisory Board, OASIS (TAB)
Former Chair, V1 - US TAG to JTC 1/SC 34
Convener, JTC 1/SC 34/WG 3 (Topic Maps)
Editor, OpenDocument Format TC (OASIS), Project Editor ISO/IEC 26300
Co-Editor, ISO/IEC 13250-1, 13250-5 (Topic Maps)

Another Word For It (blog): http://tm.durusau.net
Homepage: http://www.durusau.net
Twitter: patrickDurusau
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