# Functions
ParseLevel takes a string level and returns the RFC 2119 compliance level constant.
# Constants
May represents 'MAY' in RFC 2119.
Must represents 'MUST' in RFC 2119.
MustNot represents 'MUST NOT' in RFC 2119.
NotRecommended represents 'NOT RECOMMENDED' in RFC 2119.
Optional represents 'OPTIONAL' in RFC 2119.
Recommended represents 'RECOMMENDED' in RFC 2119.
Required represents 'REQUIRED' in RFC 2119.
Shall represents 'SHALL' in RFC 2119.
ShallNot represents 'SHALL NOT' in RFC 2119.
Should represents 'SHOULD' in RFC 2119.
ShouldNot represents 'SHOULD NOT' in RFC 2119.
# Type aliases
Level represents the RFC 2119 compliance levels.