/*
 * vCard and iCalendar share a basic format (called vText here) which has
 * these characteristics:
 *
 *  1. A line SHOULD not exceed 75 characters, plus line terminator.
 *  2. Lines terminate with a CR/LF sequence.
 *  3. Long lines may be "folded" between any two characters by terminating
 *     the current line and prefixing the following one with a space or tab
 *     character.  When unfolding a line, the terminator and the single
 *     leading whitespace character are ignored.
 *  4. Lines begin in column 1 and begin with a field name, possibly followed
 *     by one or more parameters, and finishing with a value.
 *  5. Names match the regular expression /[-A-Za-z0-9]+/.  Each vText format
 *     has a list of registered names for fields and parameters, though that
 *     is beyond the scope of vText.
 *  6. Values may contain horizontal whitespace and any textual characters.
 *     C-format escape sequences such as \n are commonly supported, but may
 *     not be in all circumstances.
 *  6. Parameters are separated from field names and each other with a semi-
 *     colon (;).  The value is delimited by a colon (:).
 *  7. In current versions of vText-using standards, parameter names are
 *     followed by an equals (=) and one or more values separated by commas
 *     (,).  This must be considered optional, however, because older versions
 *     of the same formats did neither required nor even permitted values.
 *  7. Parameter values may contain most of the characters permitted by field
 *     values except double quote (").  If a parameter value uses characters
 *     that are otherwise reserved as field delimiters, it must be enclosed in
 *     double quotes.
 *  8. Actual vText files tend to suggest the above is viewed merely as a
 *     group of suggestions rather than a ratified standard.  Naturally.
 */