https://download.eclipse.org/epsilon/interim-javadoc/org/eclipse/epsilon/hutn/model/hutn/HutnPackage.Literals.html
HutnPackage.Literals (plugins 2.9.0-SNAPSHOT API)
declaration: package: org.eclipse.epsilon.hutn.model.hutn, interface: HutnPackage, interface: Literals
literalspluginssnapshotapi