interface_element { ; interface_element }
[ constant ] identifier_list : [ in ] subtype_indication [ := static _expression ]
[ signal ] identifier_list : [ mode ] subtype_indication [ bus ] [ := static _expression ]
– subtype_indication must not be a file or pointer type.
[ variable ] identifier_list : [ mode ] subtype_indication [ := static _expression ]
file identifier_list : subtype_indication
– subtype_indication have to indicate a subtype of a file type.