Grammar not acceptig valueDomainvalues starting with "_"

[antonio-olleros]

Currently, the grammar defines:

valueDomainValue:
IDENTIFIER
| INTEGER_CONSTANT
| NUMBER_CONSTANT;

IDENTIFIER
:
LETTER ([A-Za-z0-9_.])*
| DIGITS0_9 ([A-Za-z0-9_.])+
| ''' (.)*? '''
;

Therefre, it is not posible to write hierarchy rules like: _Z = _T + A + B; but in SDMX it is very common to have codes starting with undercode (e.g., _Z for not applicable).

Grammar should be correced to allow the use of those codes.

[linardian]

Hi Antonio,
yes you are perfectly right. I am adding this issue to the #395 and #401 related with G4 and we are going to discuss it this afternoon.
Thank you for pointing it out

[vpinna80]

I agree with this change, and I also propose to refine the IDENTIFIER rule to allow:

• single quotes inside single quotes
• SDMX identifiers without quotes (agency:dataflow(version)/query).

The query part may be dropped if you think the sdmx-to-vtl mapping spec is going to be used (today it is not).
This is my proposal (including antonio's):

IDENTIFIER
  : [A-Za-z0-9_] ([A-Za-z0-9_.])*
  | ([A-Za-z0-9_.]+:)? [A-Za-z0-9_.]+ ( \([0-9._+*~]+\) )? (/[A-Za-z0-9_.]+)?
  | '\'' ( '\\\'' | [^'] )* '\''
  ;