Re: [xwiki-users] How do I run a query from a rdf database in xwiki page

Hi abrante, If I understood correctly your question, you want to know how to query (using a SPARQL query) your RDF knowledge base server (hosted on some remote machine) trough the SPARQL protocol from an XWiki page by the push of a button or link and display the results on the same page. There are 2 options: 1. Manually use the SPARQL protocol to send a HTTP request to your server trough AJAX from the XWiki page. 2. Have(make) an XWiki plugin that uses some java library like Jena or Sesame to make remote SPARQL queries and use it with Velocity from an XWiki page. For both cases, see the specification of the SPARQL protocol and how to use it over HTTP (or SOAP): http://www.w3.org/TR/rdf-sparql-protocol/#query-bindings-http If you like Option 1, then you must: 1. Create a button or link and assign it an ID. 2. Create a div or some sort of container for the result and assign it an ID as well. 3. Add a JavaScriptExtension (JSX) object to your xwiki page and observe the click event ( http://www.prototypejs.org/api/element/methods/observe ) of the element with the ID you just assigned at step 1 (your link/button). 4. Implement the JS event handler to issue an Ajax request ( http://www.prototypejs.org/learn/introduction-to-ajax ) with your hand-crafted query to your SPARQL (RDF) server. 4'. Implement the JS callback method that takes the result of the Ajax request, processes it and then dump it into your HTML container that you created at step 2 in order to show the result to the user. Here is a sample HTTP query (that works from your browser): http://www4.wiwiss.fu-berlin.de/is-group/sparql?query=SELECT * WHERE {?s ?o ?p} LIMIT 10 Encoded version looks like this: http://www4.wiwiss.fu-berlin.de/is-group/sparql?query=SELECT%20*%20WHERE%20… I hope I did not assume too much :) Good luck, Eduard On 08/17/2010 10:38 AM, abrante wrote: