org.eclipse.fx.demo.contacts.app org.eclipse.jdt.core.javabuilder org.eclipse.pde.ManifestBuilder org.eclipse.pde.SchemaBuilder org.eclipse.xtext.ui.shared.xtextBuilder org.eclipse.pde.ds.core.builder org.eclipse.pde.PluginNature org.eclipse.jdt.core.javanature org.eclipse.xtext.ui.shared.xtextNature