In the x-dns-2 approach to URN resolution, browsers are encouraged to support URCs being returned as HTML, or plain text as a last resort. There is however, an associated URC format[39], which may be used to return the results of a URN lookup in a form suitable for automatic processing.
This trivial syntax for URCs allows multiple URLs to be associated with a single URN, each with associated meta-information. It also provides a way for URC authors to indicate the language and character set of each URL.
Here is the sample URC from the previous section, expressed using the trivial syntax:
===== ftp://ftp.math.gatech.edu/pub/zsh The Z-shell, a command interpreter for many UNIX systems which is freely available to anyone with FTP access. Zsh is more powerful than every other common shell (sh, ksh, csh, tcsh and bash) put together. The maintainer is Richard Coleman, <zsh@math.gatech.edu> ===== ftp://ftp.sterling.com/zsh A mirror site in the US ===== ftp://ftp.cenatls.cena.dgac.fr/pub/shells/zsh A mirror site in France ===== ftp://mrrl.lut.ac.uk/zsh A mirror site in the UK