t already exist.
    </P
><P
>     If any prerequisite extensions are listed in <TT
CLASS="VARNAME"
>requires</TT
>
     in the control file, their target schemas are appended to the initial
     setting of <TT
CLASS="VARNAME"
>search_path</TT
>.  This allows their objects to be
     visible to the new extension's script file.
    </P
><P
>     Although a non-relocatable extension can contain objects spread across
     multiple schemas, it is usually desirable to place all the objects meant
     for externa