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5.9.2 Qualified Projects

Before the reserved project, there may be one or two `qualifiers', that is identifiers or reserved words, to qualify the project. The current list of qualifiers is:

Qualifies a project with no sources. Such a project must either have no declaration of attributes Source_Dirs, Source_Files, Languages or Source_List_File, or one of Source_Dirs, Source_Files, or Languages must be declared as empty. If it extends another project, the project it extends must also be a qualified abstract project.
A standard project is a non library project with sources. This is the default (implicit) qualifier.
A project whose sources are aggregated from other project files.
`aggregate library':
A library whose sources are aggregated from other project or library project files.
A library project must declare both attributes Library_Name` and Library_Dir.
A configuration project cannot be in a project tree. It describes compilers and other tools to `gprbuild'.