@mutable_property<EOL><INDENT>def release_scheme(self):<DEDENT>
return '<STR_LIT>'<EOL>
The repository's release scheme (a string, defaults to 'tags').

The value of :attr:`release_scheme` determines whether
:attr:`Repository.releases` is based on :attr:`Repository.tags` or
:attr:`Repository.branches`. It should match one of the values in
:data:`KNOWN_RELEASE_SCHEMES`. If an invalid value is set
:exc:`~exceptions.ValueError` will be raised.