rel-principles is a simple, open format for indicating statements of principles for the associated content, which is embeddable in HTML or XHTML, Atom, RSS, and arbitrary XML.

It uses the microformats rel design pattern, but is not currently a officially sanctioned microformat.

Abstract

By adding rel=”principles” to a hyperlink, a page indicates that the destination of that hyperlink is a description of the principles the content on the page was created under.

<a href="http://www.mediastandardstrust.org/code-of-practice" rel="principles">some statement of principles name goes here</a>

XMDP Profile

<dl class="profile">
 <dt id="rel">rel</dt>
 <dd><p>
   <a rel="help" href="http://www.w3.org/TR/html401/struct/links.html#adef-rel">
     HTML4 definition of the 'rel' attribute.</a>
   Here is an additional value.</p>
  <dl>
   <dt id="principles">statement of principles</dt>
   <dd>Indicates that the referred resource is a statement of principles for the content on the referring page.</dd>
  </dl>
 </dd>
</dl>