Nice question, i asked it as well before :), so i first wanted to shout someting like "use the super search", or somthing like that...
Anyway, how can you search for this, if you don't know what to search for, so i'm sorry for that thought :)...
Anyway, as CountZero explained, Catalyst uses it like following:

<shameless quoting>
Catalyst needs those attributes to decide which sub to call when it parses the URL. You can see it working very nicely if you run the included your_app_server.pl script. In its debug-output you see it building your packages and subs linked to the URLs it understands.
</shameless quoting>

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.