What is RSS - Archive of obsolete content
for example: <?xml version="1.0"?> <rss version="2.0"> <channel> <title>example news site</title> <description>this is an example news site.</description> <lastbuilddate>wed, 27 jul 2005 00:30:30 -0700</lastbuilddate> <link>http://news.example.com/</link> <item> <title>news flash: i like bread</title> <guid ispermalink="false">4d4a0a12-f188-4c97-908b-eea27213c2fe</guid> <pubdate>wed, 27 jul 2005 00:30:30 -0700</pubdate> <link>http://news.example.com/artcle/554</link> </item> <item> <title>big news today: birds fly</title> <guid ispermalink="false">c4a63f09-b45b-466b-8773-6ff264001ab7</guid> <pubdate>tue, 19 jul 2005 04:32:51 -0700</pubd...
...ate> <link>http://news.example.com/artcle/553</link> </item> <item> <title>fire is hot</title> <guid ispermalink="false">c1795324-d5ea-44fa-95b1-b5ce2090d4f1</guid> <pubdate>sun, 15 may 2005 13:02:08 -0700</pubdate> <link>http://news.example.com/artcle/552</link> </item> </channel> </rss> bloggers use rss to provide everyone with a list of their newest blog posts.

HTML attribute: rel - HTML: Hypertext Markup Language
link link not allowed bookmark permalink for the nearest ancestor section.
... note: the obsolete rev="made" is treated as rel="alternate" bookmark relevant as the rel attribute value for the <a> and <area> elements, the bookmark provides a permalink for ancestor section, which is the nearest ancestor <article> or <section>, if there is at least one, otherwise, the nearest heading sibling or ancestor descendant, to the next..

Link types - HTML: Hypertext Markup Language
<a>, <area>, <link> <form> bookmark indicates that the hyperlink is a permalink for the nearest ancestor <article> element.
... if none, it is a permalink for the section that the element is most closely associated to.

Proposal - Archive of obsolete content
the sguid specification provides a more granular approach by offering an sourceref element which can reference the guid permalink of the source.

Profiling with the Firefox Profiler
if you select a different time range, the url revealed by pressing "permalink" will change so that you can be sure the recipient of the url will see the same things you are seeing.

Reporting a Performance Problem
once uploaded, copy permalink url to your clipboard by right clicking and add the profile url to a bug for your performance problem and/or send it to the appropriate person.