plify database management.  <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> calls
    such a package an <I
CLASS="FIRSTTERM"
>extension</I
>.  To define an extension,
    you need at least a <I
CLASS="FIRSTTERM"
>script file</I
> that contains the
    <ACRONYM
CLASS="ACRONYM"
>SQL</ACRONYM
> commands to create the extension's objects, and a
    <I
CLASS="FIRSTTERM"
>control file</I
> that specifies a few basic properties
    of the extension itself.  If the extension includes C code, there
    will typically 