Copyright © 2001-2005 Oren Ben-Kiki, Clark Evans, Brian Ingerson
This specification is a draft reflecting consensus reached by members of the yaml-core mailing list. Any questions regarding this draft should be raised on this list.
~ # (canonical) |null|Null|NULL # (English) | # (Empty)
Devoid of value.
A null value is used to indicate the lack of a value. This is
typically converted into any native null-like value (e.g.,
undef in Perl,
in Python). Note that a null is different from an empty string and
that a mapping entry with some key and a null value is valid and
different from not having that key in the mapping.