Definitions within a package are made visible to a system or other packages by a package reference clause .
<package reference clause>::=
use <package name> [ / <definition selection list> ] <end>
<definition selection list> ::=
<definition selection> {, <definition selection>}*
<definition selection> ::=
[<entity kind>] <name>
system type
| block type
| process type
| service type
| signal
| procedure
| newtype
| signallist
| generator
| synonym
| remote