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Installing the Faceted Browsing Service

1. Install the package

You can consult the official documentation here : http://vos.openlinksw.com/owiki/wiki/VOS/VirtuosoFacetsWebService The Faceted Browsing service gives you access to a search engine interface. It can also be used for describing your resource.

That is a Virtuoso package that is by default given within the app into a .dav file format. For installing it you need to run the following command into the isql interface : vad_install('/opt/virtuoso-opensource/vad/fct_dav.vad', 0);

The application needs to index your resources for activating the search engine. The best option is to index your data when you finish loading them. A good practice is to do it after each data load by running the following commands :

  • urilbl_ac_init_db();
  • s_rank();

2. Describe behavior

Describing a resource via the facet app could be time-consuming. When we ask to describe ?s, the service will list every ongoing and outgoing property returning all the triples shaped as <?s> <?p> <?o> and as <?o> <?p> <?s>.

A tip for speeding up it is to change the describe behavior as follows with isql (see this post) :

  • INSERT INTO DB.DBA.SYS_SPARQL_HOST VALUES ('*',null,null,null,'DEFINE sql:describe-mode \"CBD\"')