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      Building Interoperable Web Metadata Hal Abelson, Ben Adida MIT
Computer Science & Artificial Intelligence Laboratory 6 April 2006 Customers IPTC NewsML Standards-compliant language strong metadata support Creative Commons 50M licensed pages
(not including Flickr photos) Self-contained HTML chunk cc:license (Similar use case to FOAF, DC, GeoURL) Demo Web Publishers Requirements of Interoperable Metadata Requirement: Publisher Independence Trackbacks URL commenting on Camera and Lens Info Resolution, Size, etc.. Requirement: Data Reuse <h2>Great New Sushi Place</h2> <p> it was amazing, I tell you. The freshest fish I've seen in years. And the toro... </p> licensed under a
<a href=”http://creativecommons.org/licenses/by-nc-nd/2.5/”>CC License</a>. Requirement: Self-Containment Requirement: Modularity Requirement: Evolvability Publisher Independence Data Reuse Self-Containment Schema Modularity Evolvability RDF/A (Primer WD #1 published 4 weeks ago) <div> licensed under a <a href=”http://cc.org/licenses/by/2.5/”> Creative Commons License </a>. </div> <div xmlns:cc="http://web.resource.org/cc/"> licensed under a <a rel=”cc:license” href=”http://cc.org/licenses/by/2.5/”> Creative Commons License </a>. </div> <div xmlns:cc="http://web.resource.org/cc/" xmlns:dc=”http://purl.org/dc/1.1/”> This document was written by <span property=”dc:creator”>Ben Adida</span> and is licensed under a <a rel=”cc:license” href=”http://cc.org/licenses/by/2.5/”> Creative Commons License </a>. </div> <div xmlns:cc="http://web.resource.org/cc/" xmlns:dc=”http://purl.org/dc/1.1/”> This document was written by <span property=”dc:creator”>Ben Adida</span> and is licensed under a <a rel=”cc:license” href=”http://cc.org/licenses/by/2.5/”> Creative Commons License </a>, and a <a rel=”cc:citeURL” href=”http://mit.edu/hal/metadata”> translation of ‘metadata’ </a>. </div> <div xmlns:cc="http://web.resource.org/cc/" xmlns:dc=”http://purl.org/dc/1.1/”> This document was written by <span property=”dc:creator”>Ben Adida</span> and is licensed under a <a rel=”cc:license” href=”http://cc.org/licenses/by/2.5/”> Creative Commons License </a>, and a <a rel=”cc:citeURL” property=”cc:derivativeDescription” href=”http://mit.edu/hal/metadata”> translation of ‘metadata’ </a>. </div> <div xmlns:cc="http://web.resource.org/cc/" xmlns:dc=”http://purl.org/dc/1.1/”> This document was written by <span property=”dc:creator”>Ben Adida</span> and is licensed under a <a rel=”cc:license” href=”http://cc.org/licenses/by/2.5/”> Creative Commons License </a>, and a <a rel=”cc:citeURL” property=”cc:derivativeDescription” href=”http://mit.edu/hal/metadata”> translation of ‘metadata’ </a>, originally by <span property=”cc:attributedTo”>Hal</span>. </div> <div xmlns:cc="http://web.resource.org/cc/" xmlns:dc=”http://purl.org/dc/1.1/” about=”photo2.jpg”> This photo was taken by <span property=”dc:creator”>Ben Adida</span> and is licensed under a <a rel=”cc:license” href=”http://cc.org/licenses/by/2.5/”> Creative Commons License </a>. </div> A Few Details Metadata about internal chunks:
about=”#feed” Existing semantics of HTML reused:
ul, ol, li RDF/A by Requirement Publisher Independence everyone decides their own schema Data Reuse rendered data = structured data Self-Containment chunk of HTML is self-contained Schema Modularity attributes are reusable Evolvability RDF/OWL equivalence statements RDF/A Elegant Degradation Fully marked up XHTML Client software interprets as much as it can understand, structuring it for the user to see. Anything the client doesn’t understand is just XHTML-rendered. <div xmlns:rss=”...” xmlns:cal=”...” xmlns:cc=”...”> <h2 property="rss:title">Events</h2> <a rel="rss:link" href="/">Calendar</a>. <p property="rss:description">Events.</p> <link rel="rss:items" href="#items" /> <ul id="items"> <li href="#item_56">Lessig - Free Culture</li> <li href="#item_57">Zittrain - E2E is Dead</li> </ul> </div> <div id="item_56" about="#item_56" role=”cal:Vevent”> <h3 property="rss:title">Lessig - Free Culture</h3> <p property="rss:description"> Larry will be giving his talk on Free Culture at <a rel=”cal:location” href=”...”>CSAIL</a> on <span property=”cal:dtstart”>2006-03-08 14:00-05</span> for about <span property=”cal:duration”>1</span> hour </p> </div> XHTML 1.1 Module RDF/A as an XHTML 1.1 Module Main differences: 
<link> and <meta> appear in BODY.
about and property attributes.
CURIES for compact URIs. SemWeb Deployment Working Group. “RDF/A's balance of XML rigour and XHTML 1.1 pragmatism (placing it between XHTML2 and microformats) makes it something that we'll be quite interested in following, and we'd like to make sure that Firefox is a suitable host for RDF/A development and deployment.” Mike Shaver, Mozilla Back to the Demo Questions? Backup Slides Technology for Web Metadata XML RDF Microformats GRDDL RDF/A XML http://shutr.net/schema.xsd <head> <title>Ulrich’s Photos</title> <link rel=”alternate” href=”/ulrich/photos/123.xml” type=”application/xml” /> </head> ... <img src=”/ulrich/photos/123.jpg” /> Beautiful Sushi. Taken on January 15th, 2006. licensed under a <a href=”http://cc.org/licenses/by/2.5/”>CC License</a>. <?xml version="1.0"?> <Photos xmlns=”http://shutr.net/schema.xsd”> ... <Photo id=”123”> <title>Beautiful Sushi</title> <creator>Ulrich</creator> <date>2006-01-15</date> <license url=”http://cc.org/licenses/by/2.5/”> ... </Photo> </Photos> <Photos xmlns=”http://shutr.net/schema.xsd”> ... <Photo id=”123”> <title>Sushi</title> <creator>Ulrich</creator> <date>2006-01-15</date> <license url=”http://cc.org/licenses/by/2.5/”> ... </Photo> </Photos> <Photos xmlns=”http://flickr.net/schema.xsd”> ... <Photo id=”456”> <title>Sushi 2</title> <creator>Ursula</creator> <date>2006-01-16</date> <license url=”http://cc.org/licenses/by-nc/2.5/”> ... </Photo> </Photos> RDF RDF - A Refresher Everything is a triple: subject, property, object. Every item is either a URI or a literal (e.g. 3, “Ben”) <> cc:license <http://cc.org/licenses/by/2.5/>. <> dc:creator “Ben Adida”. </images/sunset.jpg> dc:title “Sunset on the Beach”. <img src=”/ulrich/photos/123.jpg” /> Beautiful Sushi. Taken on January 15th, 2006. licensed under a <a href=”http://cc.org/licenses/by/2.5/”>CC License</a>. <!-- <> dc:title “Beautiful Sushi”; dc:creator “Ulrich” ; dc:date “2006-01-15” ; cc:license <http://cc.org/licenses/by/2.5/>. --> Microformats <head profile=”http://gmpg.org/hPhoto/”>
... <div class=”hPhoto”> <img class=”photo”
 src=”/ulrich/photos/123.jpg” /> <span class=”title”> Beautiful Sushi. </span> Taken on <span class=”date”> January 15th, 2006. </span> licensed under a <a rel=”license” 
 href=”http://creativecommons.org/licenses/by/2.5/”>CC License</a>. </div> “If some usage of the web is too nascent to have converged, we can’t easily codify it, so we choose to pass on the problem.” http://microformats.org/blog/2006/01/17/microformats-are-semantic-markup/ Ryan King, Microformats.org GRDDL <head profile="http://www.w3.org/2003/g/data-view"> <link rel="transformation" href="/grddl/extract-rdf.xsl" /> </head> <div class=”photo”> <img src=”/ulrich/photos/123.jpg” /> <span class=”phototitle”> Beautiful Sushi. </span> Taken on <span class=”photodate”>January 15th, 2006.</span> licensed under a <a rel=”license” href=”http://cc.org/licenses/by/2.5/”>CC License</a>. </div>
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