Semantic Web Primer 2


	Semantic Web Primer 2

SoftYare

1-23-2008 6:26 PM

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/e4f72ca1-feeb-43df-93fc-9b7fd70bf9e5/F9C804CF-5F8D-4AFB-8502-52A14CE6C03A/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.xml.com/pub/a/2000/11/01/semanticweb/index.html?page=2" href="http://www.xml.com/pub/a/2000/11/01/semanticweb/index.html?page=2" style="font-size: 11px;">www.xml.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.xml.com/pub/a/2000/11/01/semanticweb/index.html?page=2"><P class="secondary"><B>The Semantic Web: A Primer</B>
by Edd Dumbill
 | 
Pages: <A href="http://www.xml.com/pub/a/2000/11/01/semanticweb/index.html?page=1">1</A>, <B>2</B>
</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.xml.com/pub/a/2000/11/01/semanticweb/index.html?page=2"><H3>Semantic Web Technologies (con'td)</H3></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.xml.com/pub/a/2000/11/01/semanticweb/index.html?page=2"><H4><A name="rdf">RDF, RDF Schemas and Ontologies</A></H4>
<P>The W3C's <A href="http://www.w3.org/RDF/">Resource Description
Framework</A> is one of the cornerstones of Semantic Web work.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.xml.com/pub/a/2000/11/01/semanticweb/index.html?page=2">the real value of RDF is the data model.</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.xml.com/pub/a/2000/11/01/semanticweb/index.html?page=2">It defines a
very simple data model of triples (subject, predicate, object), where
subject and predicate are URIs, and the object is either a URI or a
literal. With this simple model, objects and their properties may be
represented.</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.xml.com/pub/a/2000/11/01/semanticweb/index.html?page=2">RDF schemas differ somewhat from XML schemas (such as DTDs or W3C
XML Schemas) in that they do not define a permissible syntax but
instead classes, properties, and their interrelation: they operate
directly at the data model level, rather than the syntax level.
Scaled up over the Web, RDF schemas are a key technology, as they
allow machines to make inferences about the data collected from the
web.</blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/F9C804CF-5F8D-4AFB-8502-52A14CE6C03A/blog/" title="blog or email this clip"><img src="http://content9.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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