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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.