A data service can expose data in RDF format by setting RDF as the output mapping type. This sample demonstrates how data is exposed in RDF format using a data service deployed in WSO2 EI.
About the sample
This sample uses an excel sheet as the datasource. The Products.xls file, stored in the <EI_HOME>/samples/data-services/resources/ folder is used to get the data. This datasource contains details of the products manufactured in an automobile company. Products refer to cars/motorcyles. The data table has the following columns: "ID", "Name", "Classification" and "Price". The sample data service used in this demonstration (ExposeAsRDFSample.dbs) contains a REST resource which lists down all the products that are manufactured in the company.
See Data Services and Resources for details.
Building the sample
The sample named RDFExposeAsRDFSample is shipped with WSO2 EI, by default. This .dbs file is stored in the <EI_HOME>/samples/data-services/dbs/rdf/ directory. Follow the steps given below.
- Follow the instructions in Uploading a Created Data, to deploy the sample file (RDFExposeAsRDFSample.dbs) in the ESB of WSO2 EI.
- Click Services → List on the navigator. The sample should be listed on the services' dashboard.
Running the sample
The service can be invoked in REST-style via curl (http://curl.haxx.se). The following command can be executed in the command line to retrieve the product info (stored in the <EI_HOME>/samples/data-services/resources/Products.xls file) in RDF format.
curl -X GET http://localhost:9763/services/RDFExposeAsRDFSample/vehicles
