-`-PcompileXtend=true` activates the [Xtend](http://xtend-lang.org) compiler, but this is optional because the generated Java code is included in the repository.
-`-PuseJenkinsSnapshots=true` switches to using the Maven repository generated by the [Jenkins build job](http://services.typefox.io/open-source/jenkins/job/xtext-lib/) for [xtext-lib](https://github.com/eclipse/xtext-lib). Without this argument, [Sonatype snapshots](https://oss.sonatype.org/content/repositories/snapshots) are used.