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<div>Koranteng Ofosu-Amaah 
<a href="http://koranteng.blogspot.com/2006/03/rest-elevator-pitch.html">discusses</a>
the following : 
 
<ul>
 <li>Identification Of Resources</li>
 <li>Manipulation Of Resources Through Representations</li>
 <li>Self-Descriptive Messages</li>
 <li>Hypermedia As The Engine Of Application State</li>
</ul>Fielding's 
<a href="http://www.ics.uci.edu/~fielding/pubs/dissertation/top.htm">magnum
opus</a> was published in 2000 and not only has it stood the test
of time, it generally seems to have matured with age, with
deployments gradually tending closer towards the patterns it
describes. 
 
 There is one little thing that does seem to have eroded
somewhat (though I can't remember offhand how much weight this is
given in the thesis): use of the media (mime) type. Around XML this
bit of representation metadata has become incredibly unreliable. I
had a good (wine-lubricated) argument about this with 
<a href="http://www.leosimons.com/">Leo Simons</a> when I was in
Rome the other week. My pov was that it's still really important,
Leo's was more that it's not actually necessary. I came away
unconvinced, but considerably less sure of my position. 
 
 Going back the elevator list, I've personally never really
be very sure about what 
Hypermedia As The Engine Of Application State actually
means for the Web, even less so when dealing with Semantic Web
material. "Hypermedia" seems a bit doccy for my datahead
tendencies. Whatever, there's a neater elevator pitch in those
slides of TimBL's I've been linking to a lot of late: 
<blockquote>
<a href="http://www.w3.org/2005/Talks/1110-iswc-tbl/#(4)">Web
architecture 101</a>
 
<ul>
 <li>Things are denoted by URIs.</li>
 <li>Use them to denote things.</li>
 <li>Serve useful information at them.</li>
 <li>Dereference them.</li>
</ul></blockquote>Hmm, "useful information" - that would include
data, right..? So if the data contains a liberal sprinkling of
dereferenceable URIs (which RDF should) then I guess that makes it
hypermedia...@en
</div>