VRP-REP model files is a maven project. It simply contains XML schema files, used to describe Vehicle Routing Problem instances files on the web application VRP-REP.
If you intend to use the format in a java project, you can use JAXB generated classes to read and write XML files.
The best way to go is to add the following to your pom.xml :
<dependency>
<groupId>org.vrp-rep</groupId>
<artifactId>vrprep-model</artifactId>
<version>LATEST</version>
</dependency>
Versioned JAR files are directly available from Maven central.
As of 0.1.4, the project also include a basic instance reader and writer, that you may use this way :
import java.io.File;
import org.vrprep.model.instance.Instance;
import org.vrprep.model.util.Instances;
...
Instance instance = Instances.read(inputPath);
File file = Instances.write(instance, outputPath);