identifierOrFunctionIdentifier
An identifier that may appear as a function name. Combines plain identifiers with the full set of function identifiers, which includes nearly all CQL keywords permitted as function names.
Examples
Plain function name
define function "Square"(x Integer) returns Integer: x * x
Function named with a keyword identifier
define function "ToString"(value Integer) returns String: convert value to String
EBNF
identifierOrFunctionIdentifier : identifier | functionIdentifier ;