</TT
> is up to the extension author, though
     <TT
CLASS="LITERAL"
>unpackaged</TT
> is a common convention.  If you have multiple
     prior versions you need to be able to update into extension style, use
     multiple dummy version names to identify them.
    </P
><P
>     <TT
CLASS="COMMAND"
>ALTER EXTENSION</TT
> is able to execute sequences of update
     script files to achieve a requested update.  For example, if only
     <TT
CLASS="LITERAL"
>foo--1.0--1.1.sql</TT
> and <TT
CLASS="LITERAL"
>foo-