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13.10 Attribute References

Attribute references are used to retrieve the value of previously defined attribute for a package or project. Syntax:

     attribute_reference ::=
       attribute_prefix ' <simple_attribute_>simple_name [ ( string_literal ) ]
     attribute_prefix ::=
       project |
       <project_simple_name | package_identifier |
       <project_>simple_name . package_identifier

If an attribute has not been specified for a given package or project, its value is the null string or the empty list.