is it possible to add a package of files that could be shared and referenced within a xtext project? just like the java library, when you launch the editor, user can refer to the files within such package.
Yes, to my understanding, a project wizard is you can choose to create a project of your own type. for instance, the eclipse comes with the ability to create java project and provides defaults for the java project.
If i can tailor such a project wizard for my language, then it would be nice to the users.