r11692@Kushana: nickm | 2006-12-23 22:32:41 -0500

    The BeginLine and EndLine of an Object must use the same keyword.

  When interpreting a Document, software MUST reject any document containing a

  KeywordLine that starts with a keyword it doesn't recognize.

  The "opt" keyword is reserved for non-critical future extensions.  All

  implementations MUST ignore any item of the form "opt keyword ....." when

  they would not recognize "keyword ....."; and MUST treat "opt keyword ....."

  as synonymous with "keyword ......" when keyword is recognized.

  When interpreting a Document, software MUST ignore any KeywordLine that

  starts with a keyword it doesn't recognize; future implementations MUST NOT

  require current clients to understand any KeywordLine not currently

  described.

  The "opt" keyword was used until Tor 0.1.2.5-alpha for non-critical future

  extensions.  All implementations MUST ignore any item of the form "opt

  keyword ....." when they would not recognize "keyword ....."; and MUST

  treat "opt keyword ....."  as synonymous with "keyword ......" when keyword

  is recognized.

  Implementations before 0.1.2.5-alpha rejected any document with a

  KeywordLine that started with a keyword that they didn't recognize.

  Implementations MUST prefix items not recognized by older versions of Tor

  with an "opt" until those versions of Tor are obsolete.

2. Router operation

          "Running" if the router is currently usable.

          "Valid" if the router has been 'validated'.

          "V2Dir" if the router implements this protocol.

      "v" -- The version of the Tor protocol that this server is running.  If

          the value begins with "Tor" SP, the rest of the string is a Tor

          version number, and the protocol is "The Tor protocol as supported

          by the given version of Tor."  Otherwise, if the value begins with

          some other string, Tor has upgraded to a more sophisticated

          protocol versioning system, and the protocol is "a version of the

          Tor protocol more recent than any we recognize."

      The "r" entry for each router must appear first and is required. The

      "s" entry is optional (see Section 3.1 below for how the flags are

      decided). Unrecognized flags on the "s" line and extra elements

      on the "r" line must be ignored.

      on the "r" line must be ignored.  The "v" line is optional; it was not

      supported until 0.1.2.5-alpha, and it must be preceded with an "opt"

      until all earlier versions of Tor are obsolete.

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