DOL — BasicOMS may need to be included in delimiters

We have
OMS = ... | OMS OMSTranslation | ...
OMSTranslation = ... | ’with’ LanguageTranslation+

Assuming our OMS language contains an opitonal syntax element 'with' IRI, we could have something like

ontology foo =
...
with <www.example.com>

this would be ambiguous, since it would not be clear whether the "with <www.example.com>" would be part of the basic OMS or not.

*Curly Braces for Basic OMS within DOL documents *

We have added the restriction that inside DOL documents, a Basic OMS must not use any DOL keywords, unless it is enclosed in curly braces.