>schema</TT
> parameter in
     the control file if that is given, otherwise by the <TT
CLASS="LITERAL"
>SCHEMA</TT
>
     option of <TT
CLASS="COMMAND"
>CREATE EXTENSION</TT
> if that is given, otherwise the
     current default object creation schema (the first one in the caller's
     <TT
CLASS="VARNAME"
>search_path</TT
>).  When the control file <TT
CLASS="VARNAME"
>schema</TT
>
     parameter is used, the target schema will be created if it doesn't
     already exist, but in the other two cases it mus