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NAME

       MARC::File - Base class for files of MARC records

SYNOPSIS

           use MARC::File::USMARC;

           # If you have weird control fields...
           use MARC::Field;
           MARC::Field->allow_controlfield_tags('FMT', 'LDX');

           my $file = MARC::File::USMARC->in( $filename );

           while ( my $marc = $file->next() ) {
               # Do something
           }
           $file->close();
           undef $file;

EXPORT

       None.

METHODS

   in()
       Opens a file for import. Ordinarily you will use "MARC::File::USMARC"
       or "MARC::File::MicroLIF" to do this.

           my $file = MARC::File::USMARC->in( 'file.marc' );

       Returns a "MARC::File" object, or "undef" on failure. If you
       encountered an error the error message will be stored in
       $MARC::File::ERROR.

       Optionally you can also pass in a filehandle, and "MARC::File".  will
       "do the right thing".

           my $handle = IO::File->new( 'gunzip -c file.marc.gz |' );
           my $file = MARC::File::USMARC->in( $handle );

   next( [\&filter_func] )
       Reads the next record from the file handle passed in.

       The $filter_func is a reference to a filtering function.  Currently,
       only USMARC records support this.  See MARC::File::USMARC's "decode()"
       function for details.

       Returns a MARC::Record reference, or "undef" on error.

   skip()
       Skips over the next record in the file.  Same as "next()", without the
       overhead of parsing a record you're going to throw away anyway.

       Returns 1 or undef.

   warnings()
       Simlilar to the methods in MARC::Record and MARC::Batch, "warnings()"
       will return any warnings that have accumulated while processing this
       file; and as a side-effect will clear the warnings buffer.

   close()
       Closes the file, both from the object's point of view, and the actual
       file.

   write()
       Writes a record to the output file.  This method must be overridden in
       your subclass.

   decode()
       Decodes a record into a USMARC format.  This method must be overridden
       in your subclass.

RELATED MODULES

       MARC::Record

TODO

       ·   "out()" method

           We only handle files for input right now.

LICENSE

       This code may be distributed under the same terms as Perl itself.

       Please note that these modules are not products of or supported by the
       employers of the various contributors to the code.

AUTHOR

       Andy Lester, "<andy@petdance.com>"



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