Syntax options:

       DEFAULT LOCATION
       LOCATION 'image-location'

    A default or specific location for the external routine image.
    The resulting file specification must include the type .exe.

    This can be an image file specification or merely a logical name.

    SQL selects a routine based on a combination of factors:

    o  Image string

       The location defaults to DEFAULT LOCATION, which represents
       the file specification string RDB$ROUTINES.

    o  Logical name translation

       The WITH ALL LOGICAL_NAME TRANSLATION and the WITH SYSTEM
       LOGICAL_NAME TRANSLATION clauses specify how logical names in
       the location string are to be translated.

       If no translation option is specified, or if WITH ALL LOGICAL_
       NAME TRANSLATION is specified, logical names are translated in
       the default manner.

       If WITH SYSTEM LOGICAL_NAME TRANSLATION is specified, any
       logical names in the location string are expanded using only
       EXECUTIVE_MODE logical names from the SYSTEM logical name
       table.