entry types.

:var stem.descriptor.networkstatus.NetworkStatusDocument document: **\*** document that this descriptor came from

:var str nickname: **\*** router's nickname
:var str fingerprint: **\*** router's fingerprint
:var datetime published: **\*** router's publication
:var str address: **\*** router's IP address
:var int or_port: **\*** router's ORPort
:var int dir_port: **\*** router's DirPort

:var list flags: **\*** list of :data:`~stem.Flag` associated with the relay

:var stem.version.Version version: parsed version of tor, this is **None** if
  the relay's using a new versioning scheme
:var str version_line: versioning information reported by the relay
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