Question about tags withen tags

["Patrick Kellum" <webmaster@quahog-library.com>]

I've noticed some feeds entities to put tags within rss feeds while others
just put the tags in.  Which is the proper method?

Example:

<title>&lt;i&gt;italic&lt;/i&gt; in the title</title>

<title><i>italic</i> in the title</title>

The first method seems most common, and much easer to process, but I noticed
the second form tonight.

Just wondering if I need to re-write my php code to handle the second method
:-)  I hope not because it looks like it's going to be tough to work around.

Patrick
---
"Every weekday morning the school bell cast its glamour over
 the surrounding hills, calling the young to classes.  They came
 running down the slopes and leaping over the streams, out from
 caves and the hollows of trees and suburban tract homes, impelled
 by powers greater then their own to gain an education."
    "The Iron Dragon's Daughter" by Michael Swanwick