symbols property
Symbols is how many top-level declarations the file defines. A file with none is still listed: the file set is the authority here and the counts decorate it.
Please note: This property should have been non-nullable! Since the specification file does not include a default value (using the "default:" property), however, the generated source code must fall back to having a nullable type. Consider adding a "default:" property in the specification file to hide this note.
Implementation
int? symbols;