Module version 

YAML version handling for %YAML directive support.

The YAML 1.2.2 spec is the default. A %YAML 1.1 directive enables YAML 1.1 implicit-resolution rules (yes/no/on/off as booleans).

Enums

YamlVersion

YAML spec version, derived from a %YAML major.minor directive or defaulted when no directive is present.