Definition of terms for project maintenance : see also http://reluk.ca/project/wayic/refractory/index.brec abstract ─ adjective - (of a type) Instantiable only as a subtype. command directory - The directory in which shell commands are issued, where project installations are accessible by their proper paths. concrete ─ adjective - (of a type) Instantiable as itself, not only as a subtype. proper package, of a project - The Java package that identifies the project. proper path , of a project - The relative file path that identifies the project universally. , of a project file - The proper path of the project extended to the file. \ Copyright © 2020-2021 Michael Allan. Licence MIT.