[YANG] YANG syntax

[Ladislav Lhotka <lhotka at cesnet.cz>]

Hi,

here are my comments and questions on YANG syntax and its description in
the -02 draft:

- An unquoted + is allowed as a string parameter. I think this is too
fragile as + can appear in numbers and also as a concatenation operator.
I suggest to require isolated + to be quoted.

- The draft should probably clearly specify that recursive containment
is not allowed.

- Can a submodule use definitions from its parent module - automatically
or via "include"?

- Production rules for all statements except module and submodule are
labelled "<keyword>-stmt". For the sake of consistency, the rules for
module and submodule should be renamed to module-stmt and
submodule-stmt.

- Is it necessary to keep meta-stmts and submodule-meta-stmts distinct?
Their productions are identical.

- float-value requires a sign ("+/"-") in the exponent, pyang allows
floats like 6.022E23. Maybe the sign should be made optional?

- The "boolean" type in W3C and RELAX NG datatype libraries allow as
values either true/false or 1/0. Would it be a problem to allow this in
YANG, too?

- I don't really understand the keyref statement and its path
expression. An example would be helpful.

- bit-stmt - all substatements are optional but braces are required.

- presence keyword is missing in Table 30 in App. B.

- unique-arg  should have "1*SP" instead of "1*sp"

- descendant-schema-nodeid should be an alternative?
  descendant-schema-nodeid
                       = node-identifier /
                         absolute-schema-nodeid

- What is the role of unknown-statement in stmtsep and stmtend?

   
Lada

-- 
Ladislav Lhotka, CESNET
PGP Key ID: E74E8C0C

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