/* $DOC$
   $AUTHOR$
      Copyright 2001-2002 David G. Holm <dholm@jsd-llc.com>
   $TEMPLATE$
      Procedure
   $NAME$
      __dbSDF()
   $CATEGORY$
      API
   $SUBCATEGORY$
      Database
   $ONELINER$
      Copies the contents of a database to an SDF text file or appends the
      contents of an SDF text file to a database.
   $SYNTAX$
      __dbSDF( <lExport>, <xcFile>, [<aFields>],
         [<bFor>], [<bWhile>], [<nNext>], [<nRecord>], <lRest> )
   $ARGUMENTS$
      <lExport> If set to .T., copies records to an SDF file.
      If set to .F., append records from an SDF file.

      <xcFile> The name of the text file to copy to or append from.
      If a file extension is not specified, ".txt" is used by default.

      <aFields> An array of field names to limit the processing to. If not
      specified, or if empty, then all fields are processed.

      <bFor> An optional code block containing a FOR expression that will
      reduce the number of records to be processed.

      <bWhile> An optional code block containing a WHILE expression that will
      reduce the number of records to be processed.

      <nNext> If present, but <nRecord> is not present, specifies to process
      this number of records, starting with the current record.
      A value of 0 means to process no records.

      <nRecord> If present, specifies the only record to process. A value of 0
      means to process no records. Overrides <nNext> and <lRest>.

      <lRest> If <lExport> is .T., then if <lRest> is set to .T. and there are
      no <nRecord>, <nNext>, or <bWhile> arguments, processes all records from
      current to last.
   $DESCRIPTION$
      __dbSDF() copies all or selected contents of a database table to an SDF
      text file or appends all or selected contents of an SDF text file to a
      database table.
   $EXAMPLES$
      // Copy delinquent accounts into an SDF text file.
      USE accounts NEW
      COPY TO overdue SDF FOR ;
         ! Empty( accounts->duedate ) .AND. ;
         Date() - accounts->duedate > 30
      // Import new customer records.
      USE customer NEW
      APPEND FROM customer SDF
   $STATUS$
      S
   $COMPLIANCE$
      C
   $PLATFORMS$
      All
   $FILES$

   $SEEALSO$
      __dbDelim(), APPEND FROM, COPY TO
   $END$
 */