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%META:TOPICPARENT{name="VirtuosoFacetsWebService"}% ---+Custom Controlling Virtuoso Labels for URI functionality %TOC% ---++What is this? A component of Virtuoso's DBMS hosted faceted browser engine for Linked Data that enhances UI by automagically relegating URIs to the <code>@href</code> attributes of an HTML anchor while using <code>label</code> property values for actual anchor text. ---++Why is this important? The fundamental UI/UX goal of Linked Data oriented client solutions should always be to make URIs invisible without compromising their inherent power re. Web experience e.g., the ability to drill-down from an position on the WWW graph using click (de-reference) based follow-your-nose patterns. URIs lie at the very core of that makes the Web and its Linked Data dimension tick. Unfortunately, they are also distracting to most end-users thereby compromising UI aesthetics. ---++How do I use this functionality? First, lets understand the fundamental challenge. There are a number of annotation oriented attributes (or predicates) used in relations across databases, data spaces, and stores the exposed access to Linked Data. Unfortunately, there isn't a universally adopted attribute/predicate for 'labels', since everyone doesn't uniformly use <code>rdfs:label</code> when constructing Linked Data. Virtuoso solves the problem at hand by enabling you to populate a named graph with <code>rdfs:subPropertyOf</code> and <code>owl:equivalentProperty</code> relations (triples) that map disparate annotation properties to Virtuoso's in-built <code>virtrdf:label</code> annotation property. Once in place, the aforementioned named graph is then used as the basis for an inference rule that's optionally available for use via SPARQL and/or the Faceted Browser. ---+++Example This is example is focuses on the in-built 'facets' named graph that is used by faceted browser engine. ---++++ Prerequisites Make sure the following packages are installed: * [[http://s3.amazonaws.com/opldownload/uda/vad-packages/6.1/virtuoso/cartridges_dav.vad][Cartridges]]; * [[http://s3.amazonaws.com/opldownload/uda/vad-packages/6.1/virtuoso/fct_dav.vad][Virtuoso Faceted Browser]]. ---++++ Basic Steps 1 Load for ex. http://www.w3.org/People/Berners-Lee/card by accessing: <verbatim> http://localhost:8890/about/html/http://www.w3.org/People/Berners-Lee/card </verbatim> %BR%%BR%<img src="%ATTACHURLPATH%/lb0.png" />%BR%%BR% 1 View http://cname/describe/?url=http://www.w3.org/People/Berners-Lee/card%23i, so for ex.: <verbatim> http://localhost:8890/describe/?url=http://www.w3.org/People/Berners-Lee/card%23i </verbatim> 1 As result the "About" value will be shown as URI: <verbatim> http://www.w3.org/People/Berners-Lee/card#i </verbatim> %BR%%BR%<img src="%ATTACHURLPATH%/lb1.png" />%BR%%BR% 1 Next use SPARQL 1.1 Update Statement to populate the 'facets' named graph: <verbatim> SPARQL INSERT INTO GRAPH <facets> { <http://www.w3.org/2000/01/rdf-schema#label> rdfs:subPropertyOf virtrdf:label . <http://purl.org/dc/elements/1.1/title> rdfs:subPropertyOf virtrdf:label . <http://xmlns.com/foaf/0.1/name> rdfs:subPropertyOf virtrdf:label . <http://xmlns.com/foaf/0.1/nick> rdfs:subPropertyOf virtrdf:label . <http://www.geonames.org/ontology#name> rdfs:subPropertyOf virtrdf:label . } ; Query result: callret-0 ANY Insert into <facets>, 5 (or less) triples -- done No. of rows in result: 1 </verbatim> 1 Use the named graph above as the basis for an inference rule or simply issue this command whenever you've added new relations to the 'facets' named graph: <verbatim> rdfs_rule_set ('facets', 'facets'); </verbatim> * Note: In situations where you have alternative named graphs (e.g. '<code>virtrdf-label</code>') which the relations you seek in an alternative named graph, you can bring those to bear by issuing the following command: <verbatim> rdfs_rule_set('facets','virtrdf-label'); </verbatim> 1 View again http://cname/describe/?url=http://www.w3.org/People/Berners-Lee/card%23i, so for ex.: <verbatim> http://localhost:8890/describe/?url=http://www.w3.org/People/Berners-Lee/card%23i </verbatim> 1 As result the "About" value will be shown as label: <verbatim> TimBL </verbatim> %BR%%BR%<img src="%ATTACHURLPATH%/lb2.png" />%BR%%BR% ---++Related * Facets Web Service: * [[VirtuosoFacetsWebService][Virtuoso Facets Web Service]] * Linked Data: * [[VirtuosoFacetsViewsLinkedData][Faceted Views over Large-Scale Linked Data]] * Facet Browser Installation and configuration: * [[VirtFacetBrowserInstallConfig][Virtuoso Facet Browser Installation and configuration]] * Facet APIs: * [[VirtFacetBrowserAPIs][Virtuoso APIs for FCT REST services]] * [[VirtFacetBrowserAPIsFCTEXEC][<code><nowiki>fct_exec</nowiki></code> API Example]] * Pivot Viewer and CXML: * [[http://virtuoso.openlinksw.com/dataspace/dav/wiki/Main/VirtSparqlCxmlFacetPivotBridge#AncSparqlCxmlFacetPivotBridge][Facet Pivot Bridge - A bridge to PivotViewer from Virtuoso's Faceted query service for RDF]] * [[http://virtuoso.openlinksw.com/dataspace/dav/wiki/Main/VirtSparqlCxml#AncFacetTypeAutoDetection][Auto-Detection of Facet Type]] * Tutorials: * [[VirtuosoLODSampleTutorial][Faceted Browsing Sample using LOD Cloud Cache data space]] * [[VirtuosoFacetsWebServiceSOAPExample][SOAP Facets Example]] * [[VirtFacetBrowserInstallConfigQueried][Querying The Facet Browser Web Service endpoint]] * [[VirtFCTFeatureQueries][Virtuoso Facet Browser Featured Queries]] * [[http://virtuoso.openlinksw.com/dataspace/dav/wiki/Main/VirtVisualizeWithPivotViewer#GenFCT][Visualizing Your Data With PivotViewer Using The Facet Browser]] * [[VirtuosoFacetsWebServiceCustmExamples][Facets Web Service: Examples for customizing different types]] * [[VirtuosoFacetsWebServiceChoiceExample][Facets Web Service: Choice of Labels Example]] * Downloads: * [[http://sourceforge.net/project/showfiles.php?group_id=161622&package_id=319652][Virtuoso 6.0 TP1]] * [[http://s3.amazonaws.com/opldownload/uda/vad-packages/6.2/virtuoso/fct_dav.vad][Virtuoso Facet Browser VAD package]]

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