PhyloSoC:BioPerl integration of the NeXML exchange standard and Bio::Phylo toolkit/nexml module design

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Revision as of 07:20, 21 June 2009 by Chmille4 (talk) (Synopsis)
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Nexml Item Module Design (work in progress)


Currently, parsing a nexml file into Bioperl makes use of the *IO modules (AlignIO, SeqIO, and TreeIO) to load nexml represented data into Bioperl objects. These modules will handle each data type separately, but the ultimate goal is to make this easier on the user and allow the full parsing of a nexml document into a bioperl object that can contain each data type and maintain the relationships between them. To accomplish this, a Bio::Nexml module will be created that will act as a representation of an entire Nexml document and will hold seq, aln, and tree objects. Creating a new class will provide a way to maintain relationships between the data and will also make it more clear to the user that this represents an entire nexml document. It will be a simple container that lets the majority of the work be done by the object classes it contains making use of the modules/methods previously written during this project.


#something like this

#create and cache an xml parser linked to the stream
$nexml_doc = Bio::NeXML->new(-file=>'a_nexml_file.xml');

#allow reading of different object types
#by using previously implemented method Bio::TreeIO::Nexml->next_tree()
$tree = $nexml_doc->next_tree()

Interesting Points

  • To maintain the ability to parse individual datatypes (i.e. $tree_doc = Bio::TreeIO->new( -format => 'nexml')) as well as an entire document (i.e $nexml_doc = Bio::NeXML->new(-file 'thefile.xml')), the code that currently resides in the next_seq, next_tree, and next_aln functions will be moved to a Bio::Nexml::Util module. This allows the code to live in a single place and still be used by both the Bio::*IO::nexml modules as well as the Bio::Nexml module.

Data Relationships to Maintain

  • Sequences <=> Nodes
  • Alignments <=> Trees
  • Taxa <=> Trees
  • Taxa <=> Alignments
  • Taxon <=> Node