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=head1 NAME

NetApp::Snapshot::Delta -- OO class which represents a single snapshot delta

=head1 SYNOPSIS

    use NetApp::Filer;
    use NetApp::Snapshot;

    my $filer = NetApp::Filer->new({ .... });

    my $volume = $filer->get_volume( $volname );

    my @deltas = $volume->get_snapshot_deltas;

    foreach my $snapshot ( $volume->get_snapshots ) {

        my @deltas = $snapshot->get_snapshot_deltas;

    }

=head1 DESCRIPTION

This class encapsulates a single snapshot delta.

=head1 INSTANCE METHODS

There are 5 key instance methods, each of this returns the data from
the column of the same name in the snap delta table.

=over

=item get_from

=item get_to

=item get_changed

=item get_time

=item get_rate

=back

=head2 is_summary

This method returns true of false, indicating that the delta was a
summary, as opposed to an individual delta.

=cut