61 Use of indefinite article where StE has definite article

A - feature is pervasive or obligatory2
B - feature is neither pervasive nor extremely rare6
C - feature exists, but is extremely rare9
D - attested absence of feature47
X - feature is not applicable (given the structural make-up of the variety/P/C)6
? - no information on feature is available6

Feature area:
Noun phrase
Typical example:
A sun was shining.
Example source:
constructed
Variety World Region Type Value
Id Primary text Variety Variety Type