---
name: "Bio::DB::GFF::Aggregator::alignment"
section: "3pm"
platform: "linux"
package: "libbio-db-gff-perl"
version: "1.7.4-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/Bio::DB::GFF::Aggregator::alignment"
---

# Bio::DB::GFF::Aggregator::alignment(3pm)

## NAME

Bio::DB::GFF::Aggregator::alignment -- Alignment aggregator

## SYNOPSIS

```
  use Bio::DB::GFF;
  # Open the sequence database
  my $db      = Bio::DB::GFF->new( -adaptor => 'dbi:mysql',
                                   -dsn     => 'dbi:mysql:elegans42',
                                   -aggregator => ['alignment'],
                                 );
 -----------------------------
 Aggregator method: alignment
 Main method:       (none)
 Sub methods:       nucleotide_match,EST_match,cDNA_match,expressed_sequence_match,
                    translated_nucleotide_match,protein_match,HSP
 -----------------------------
```

## DESCRIPTION

Bio::DB::GFF::Aggregator::alignment is one of the default aggregators, and was written to be compatible with the C elegans GFF files.  It aggregates raw "similarity" features into composite features of type "alignment".  A better name for this class might be "gapped\_alignment."

This aggregator does not insist that there be a single top-level feature that spans one end of the alignment to the other.  As a result, it can produce truncated alignments if the entire alignment is not contained within the segment of interest.

### aggregate

```
 Title   : aggregate
 Usage   : $features = $a->aggregate($features,$factory)
 Function: aggregate a feature list into composite features
 Returns : an array reference containing modified features
 Args    : see L<Bio::DB::GFF::Aggregator>
 Status  : Public
```

Because of the large number of similarity features, the **aggregate()** method is overridden in order to perform some optimizations.

### method

```
 Title   : method
 Usage   : $aggregator->method
 Function: return the method for the composite object
 Returns : the string "alignment"
 Args    : none
 Status  : Public
```

### part\_names

```
 Title   : part_names
 Usage   : $aggregator->part_names
 Function: return the methods for the sub-parts
 Returns : the full list of aggregated methods
 Args    : none
 Status  : Public
```