ulink.hyphenate — Allow URLs to be automatically hyphenated
If not empty, the specified character (or more generally, content) is
added to URLs after every character included in the string
ulink.hyphenate.chars parameter (default
is “/”). If the character in this parameter is a
Unicode soft hyphen (0x00AD) or Unicode zero-width space (0x200B), some FO
processors will be able to reasonably hyphenate long URLs.
As of 28 Jan 2002, discretionary hyphens are more widely and correctly supported than zero-width spaces for this purpose.