A Directory begins with a "signed-directory" item, followed by one each of
the following, in any order: "recommended-software", "published",
"running-routers". It may include any number of "opt" items. After these
-items, a directory includes any number of router descriptors, and a singer
+items, a directory includes any number of router descriptors, and a single
"directory-signature" item.
"signed-directory"
"published" YYYY-MM-DD HH:MM:SS
"recommended-software" comma-separated-version-list
"running-routers" comma-separated-nickname-list
- "directory-signature" NL Signature
+ "directory-signature" nickname-of-dirserver NL Signature
Note: The router descriptor for the directory server must appear first.
The signature is computed by computing the SHA-1 hash of the