Deploying Linked Data Guide - Appendix B: New Proxy URI Formats

Deploying Linked Data Guide - TOC

As of September 2009, the Sponger proxy paths /about/html and /about/rdf have been augmented to support a richer slash URI scheme for identifying an entity and its metadata in a variety of representation formats.

The proxy path /about/html returns an XHTML description of an entity as before, but now includes richer embedded RDFa. Although some of the examples in this document still refer to /about/rdf (which is still usable), please bear in mind that this path has been deprecated in favour of /about/id.

The new proxy path /about/id returns an RDF description of an entity, using a default serialization format of RDF/XML. Different serialization formats can be requested by specifying the appropriate media type in an Accept header. Supported alternative formats are N3, Turtle (TTL), NTriples or JSON. Alternatively, rather than using /about/id in combination with an Accept header specifying a media type, it is also possible to request a serialization format directly using another new proxy path /about/data. In this case, no Accept header is required as the required format is specified as part of the request URL.

To dereference the description of a Web-addressable resource via your browser simply type in one of the following URL patterns:

HTML description - http://<sponger proxy host>/about/html/<URLscheme>/<hostname>/<localpart>
RDF description - http://<sponger proxy host>/about/data/<format>/<URLscheme>/<hostname>/<localpart> where format is one of xml, n3, nt, ttl or json.

Examples

The examples which follow, illustrating how RDF metadata about a product described at www.bestbuy.com can be requested in different formats, use a public Virtuoso Sponger service hosted at http://linkeddata.uriburner.com. For more information refer to the URIBurner Wiki.

Notice how requests to /about/id are redirected to /about/html, /about/data/nt, /about/data/xml or /about/data/json depending on the requested format. The required URL rewriting rules are preconfigured when the cartridges VAD is installed.

HTML+RDFa based metadata

curl -I -H "Accept: text/html" "http://linkeddata.uriburner.com/about/id/http/www.bestbuy.com/site/olspage.jsp?skuId=9491935&type=product&id=1218115079278"

HTTP/1.1 303 See Other
Server: Virtuoso/05.11.3040 (Solaris) x86_64-sun-solaris2.10-64  VDB
Connection: close
Content-Type: text/html; charset=ISO-8859-1
Date: Tue, 01 Sep 2009 21:41:52 GMT
Accept-Ranges: bytes
Location: http://linkeddata.uriburner.com/about/html/http/www.bestbuy.com/site/olspage.jsp?skuId=9491935&type=product&id=1218115079278
Content-Length: 13

or

curl -I -H "Accept: application/xhtml+xml" "http://linkeddata.uriburner.com/about/id/http/www.bestbuy.com/site/olspage.jsp?skuId=9491935&type=product&id=1218115079278"

HTTP/1.1 303 See Other
Server: Virtuoso/05.11.3040 (Solaris) x86_64-sun-solaris2.10-64  VDB
Connection: close
Content-Type: text/html; charset=ISO-8859-1
Date: Thu, 03 Sep 2009 14:33:45 GMT
Accept-Ranges: bytes
Location: http://linkeddata.uriburner.com/about/html/http/www.bestbuycom/site/olspage.jsp?skuId=9491935&type=product&id=1218115079278
Content-Length: 13

N3 based metadata

curl -I -H "Accept: text/n3" "http://linkeddata.uriburner.com/about/id/http/www.bestbuy.com/site/olspage.jsp?skuId=9491935&type=product&id=1218115079278"

HTTP/1.1 303 See Other
Server: Virtuoso/05.11.3040 (Solaris) x86_64-sun-solaris2.10-64  VDB
Connection: close
Date: Tue, 01 Sep 2009 21:38:44 GMT
Accept-Ranges: bytes
TCN: choice
Vary: negotiate,accept
Content-Location: /about/data/nt/http/www.bestbuy.com/site/olspage.jsp?skuId=9491935%26type=product%26id=1218115079278
Content-Type: text/n3; qs=0.8
Location: http://linkeddata.uriburner.com/about/data/nt/http/www.bestbuy.com/site/olspage.jsp?skuId=9491935%26type=product%26id=1218115079278
Content-Length: 13

RDF/XML based metadata

curl -I -H "Accept: application/rdf+xml" "http://linkeddata.uriburner.com/about/id/http/www.bestbuy.com/site/olspage.jsp?skuId=9491935&type=product&id=1218115079278"

HTTP/1.1 303 See Other
Server: Virtuoso/05.11.3040 (Solaris) x86_64-sun-solaris2.10-64  VDB
Connection: close
Date: Tue, 01 Sep 2009 21:33:23 GMT
Accept-Ranges: bytes
TCN: choice
Vary: negotiate,accept
Content-Location: /about/data/xml/http/www.bestbuy.com/site/olspage.jsp?skuId=9491935%26type=product%26id=1218115079278
Content-Type: application/rdf+xml; qs=0.95
Location: http://linkeddata.uriburner.com/about/data/xml/http/www.bestbuy.com/site/olspage.jsp?skuId=9491935%26type=product%26id=1218115079278
Content-Length: 13

JSON based metadata

curl -I -H "Accept: application/rdf+json" "http://linkeddata.uriburner.com/about/id/http/www.bestbuycom/site/olspage.jsp?skuId=9491935&type=product&id=1218115079278"

HTTP/1.1 303 See Other
Server: Virtuoso/05.11.3040 (Solaris) x86_64-sun-solaris2.10-64  VDB
Connection: close
Date: Tue, 01 Sep 2009 11:22:52 GMT
Accept-Ranges: bytes
TCN: choice
Vary: negotiate,accept
Content-Location: /about/data/json/http/www.bestbuycom/site/olspage.jsp?skuId=9491935%26type=product%26id=1218115079278
Content-Type: application/rdf+json; qs=0.7
Location: http://linkeddata.uriburner.com/about/data/json/http/www.bestbuycom/site/olspage.jsp?skuId=9491935%26type=product%26id=1218115079278
Content-Length: 13

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