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Status: Reported (1)

RFC6868, "Parameter Value Encoding in iCalendar and vCard", February 2013

Source of RFC: IETF - NON WORKING GROUP

Errata ID: 4374

Status: Reported
Type: Technical

Reported By: Worik Stanton
Date Reported: 2015-05-21

Section 3 says:

   When parsing iCalendar or vCard parameter values, the following
   apply:

   o  the character sequence ^n (U+005E, U+006E) is decoded into an
      appropriate formatted line break according to the type of system
      being used

   o  the character sequence ^^ (U+005E, U+005E) is decoded into the ^
      character (U+005E)

   o  the character sequence ^' (U+005E, U+0027) is decoded into the "
      character (U+0022)

   o  if a ^ (U+005E) character is followed by any character other than
      the ones above, parsers MUST leave both the ^ and the following
      character in place

It should say:


   When parsing iCalendar or vCard parameter values, the following
   apply:

   o  first all occurrences of the character sequence ^n (U+005E,
      U+006E) is decoded into an appropriate formatted line break
      according to the type of system being used

   o  second all occurrences of the character sequence ^' (U+005E,
      U+0027) is decoded into the " character (U+0022)

   o  third all occurrences of the character sequence ^^ (U+005E,
      U+005E) is decoded into the ^ character (U+005E)

   o  if a ^ (U+005E) character is followed by any character other than
      the ones above, parsers MUST leave both the ^ and the following
      character in place

Notes:

It is unclear how a string like: FOO=^^n should be decoded.

Possibly FOO=^n or FOO=^\n or FOO=\n

Section 3 implies that ^n is converted first, then ^^, then ^'. But it is not explicit. Also this leads to a contradiction. FOO=^^n will become FOO=\n, not what is expected.

An equally reasonable interpretation is to proceed from the left and convert as encountered.

The first gives FOO=\n the second FOO=^n.

In the absence of an explicit definition of the order of interpretation it is impossible to decide which to use.


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