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SA-REST: Semantically Enhancing RESTful Services and Resources

SA-REST as a member submission was accepted by the W3C on May 2010.

Following is the introduction from the W3C submission. Please refer to the W3C submission document for the complete specification.


Semantic Annotations for REST (SA-REST) define three basic
properties that can be used to non-intrusively annotate HTML/XHTML
documents, typically to embed ontological meta-data. These properties,
defined as a poshformat, are
included as part of the XHTML document allowing a capable processor to gain extra information
about the content of the document. Poshformats are the superset of microformats.
While a poshformat may follow certain microformat design principles, it may not have gone through a rigorous
community process as defined by microformat process guidelines.

properties, namely domain-rel,sem-rel and sem-class
are specified using the class attribute and the title
attribute defined by the HTML specification. Similar to microformats, the scope of the annotation is defined by the HTML element that bears the

The following example illustrates an XHTML fragment embedded with
SA-REST annotations. The original text fragment is from Wikipedia for
the subject computer. The markup in class="Code">bold highlight the SA-REST annotations.

(001) <p>
(002) A <b><span class="sem-class" title=""> computer </span></b>
(003) is a <a href="/wiki/Machine" title="Machine">machine</a> that manipulates
(004) <a href="/wiki/Data_(computing)" title="Data (computing)">data</a> according
(005) to a set of <a href="/wiki/Source_code" title="Source code">instructions</a>.
(006) </p>
(007) <p>
(008) <span class="domain-rel" title="" >
(009) Although mechanical examples of computers have existed through much of recorded human
(010) history, the first electronic computers were developed in the mid-20th century (1940â1945).</span> </p>

Line (002) illustrates the specification of the term
using the sem-class property. Lines (008) to
(010) exemplify the marking up of the text fragment to indicate that it
belongs to the domain History of Computing.

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