Search API (LFASparql)

Size: px

Start display at page:

Download "Search API (LFASparql)"

Emmeline Poole
5 years ago
Views:

1 Search API (LFASparql) LFASparql is a JavaScript library to search for resources on LOD4ALL. By using the LFASparql, you will be able to cross-search for resources of data sets that are registered in LOD4ALL, such as Subject?S, Predicate?P, or Object?O. In this page, you will find the following information: 1. How to use LOD4all API? 2. Sample code 1. How to use LOD4all API? You can use our API by following these steps: 1.Import jquery and LFASparql LFASparql uses the jquery inside. Please import jquery when you use LFASparql. jquery version should be 1.5 or later. For LFASparql, you can download from or refer directly. Here is a sample code about how to import: 2. Create an instance of the class LFASparql var lfasparql = new LFASparql (); 3. Send search requests You can send a request to LOD4ALL by using the execute method. Parameters for the method are appid (application ID), search keys (subject:s, predicate:p and object:o) and callback function names when the request is either succeeded or failed. For search key, you need to specify at least one subject or object. This means that you can issue following 4 pattern requests; {S? P? O, {S P? O, {? S P O or {? S? P O. In addition, only resource can be S, P and O. Page 1 of 7

2 // FPlease specify the "xawsaykmcb" for the application ID in a request // {S?p?o ); // {S P?o predicate: " ); // {?s P O predicate: " ); // {?s?p O ); If you want to issue multiple requests at one time, please use executemultiple method. var queries = []; // {S?p?o queries.push([" "", ""]); // {S P?o queries.push([" " ""]); // {?s P O queries.push(["", " " // {?s?p O queries.push(["", "", " lfasparql.executemultiple ({ queries: queries, ); Page 2 of 7

3 4. Retrieve search result As described above, when a result is returned from LOD4All, a method specified by success or error parameters will be called back, such as: a) If a request is succeeded, a JavaScript object is passed as a parameter. The object is generated from JSON (please refer to the following example). b) If a request is failed, jqxhr object, a string about error status and a status of HTTP are returned. This is the same error callback function as the ajax method in jquery. A sample callback functions are as follows: for(var i = 0; i < data.length; i++) { console.log("subject: " + data[i]["s"] + ", Predicate: " + data[i]["p"] + ", Object: " + data[i]["o"]) console.log("textstatus"); The following is the JSON format of the response. In multiple requests, one more list is wrapped over this result. { ] "p": { "value": " "s": { "value": "" "o": { "type": "literal", "value": "El Faraón de Camas", { "p": { "value": " "s": { "value": " "o": { "type": "literal", "Value" : "18,. Page 3 of 7

4 2. Sample code Single request code: <!DOCTYPE html> <html> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8"> <script type="text/javascript"> var lfasparql = new LFASparql(); $(document).ready( function() { test(); ); function test() { // {S,?p,?o ); // {S, P,?o /* predicate: " );*/ // {?s, P, O /* predicate: " );*/ // {?s?p O /* );*/ for (var i = 0; i < data.length; i++) { triple = data[i]; $("#result").append( Page 4 of 7

5 ); "<li>" + triple["s"]["type"] + ": " + triple["s"]["value"] + ", " + triple["p"]["type"] + ": " + triple["p"]["value"] + ", " + triple["o"]["type"] + ": " + triple["o"]["value"] + "</li>" console.log(textstatus) </script> <title>api Test</title> </head> <body> <h3>api Test</h3> <ol id="result"> </ol> </body> </html> Multiple requests code: <!DOCTYPE html> <html> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8"> <script type="text/javascript"> var lfasparql = new LFASparql(); $(document).ready( function() { test(); ); function test() { var queries = []; queries.push([" "", ""]); queries.push([" " ""]); queries.push(["", " " queries.push(["", "", " lfasparql.executemultiple({ queries: queries, ); for (var i = 0; i < data.length; i++) { for (var j = 0; j < data[i].length; j++) { Page 5 of 7

6 triple = data[i][j]; $("#result").append( "<li>" + triple["s"]["type"] + ": " + triple["s"]["value"] + ", " + triple["p"]["type"] + ": " + triple["p"]["value"] + ", " + triple["o"]["type"] + ": " + triple["o"]["value"] + "</li>" ); console.log(textstatus) </script> <title>api Test</title> </head> <body> <h3>api Test</h3> <ol id="result"> </ol> </body> </html> Two-hops traversal request code: <!DOCTYPE html> <html> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8"> <script type="text/javascript"> var lfasparql = new LFASparql(); // { // //?x // $(document).ready( function() { first_hop(); ); function first_hop() { predicate: " success: second_hop, ); function second_hop(data) { Page 6 of 7

var queries = []; for(var i = 0; i < data.length; i++){ triple = data[i]; if(triple["o"]["type"] == "uri"){ queries.push([triple["o"]["value"], "http://dbpedia.org/ontology/abstract", ""]); lfasparql.

7 var queries = []; for(var i = 0; i < data.length; i++){ triple = data[i]; if(triple["o"]["type"] == "uri"){ queries.push([triple["o"]["value"], " ""]); lfasparql.executemultiple({ queries: queries, ); for (var i = 0; i < data.length; i++) { for (var j = 0; j < data[i].length; j++) { triple = data[i][j]; $("#result").append( "<li>" + triple["s"]["type"] + ":" + triple["s"]["value"] + "," + triple["p"]["type"] + ":" + triple["p"]["value"] + "," + triple["o"]["type"] + ":" + triple["o"]["value"] + "</li>" ); console.log(textstatus) </script> <title>api Test</title> </head> <body> <h3>api Test</h3> <ol id="result"> </ol> </body> </html> Contact FUJITSU Camino Cerro de los Gamos, Pozuelo de Alarcón Madrid (Spain) Copyright: Fujitsu Contact: Todos los derechos reservados, especialmente para patentes, patentes de utilidad y patentes de diseño. Se esperan cambios técnicos y de disponibilidad. En este documento pueden aparecer términos de marca registrada, cuyo uso por terceras partes para fines propios podría infringir los derechos de propiedad de marca registrada. Page 7 of 7

CL_55244 JavaScript for Developers

CL_55244 JavaScript for Developers www.ked.com.mx Av. Revolución No. 374 Col. San Pedro de los Pinos, C.P. 03800, México, CDMX. Tel/Fax: 52785560 Por favor no imprimas este documento si no es necesario. About this course. This course is