This module implements a hierarchical data structure for BLAST results,
there is an alternative flat structure in the Bio.Alignment.BlastFlat module.
BLAST is a tool for searching in (biological) sequences for
similarity. This library is tested against NCBI-blast version
2.2.14. There exist several independent versions of BLAST, so expect some
incompatbilities if you're using a different BLAST version.
For parsing BLAST results, the XML format (blastall -m 7) is by far the most
robust choice, and is implemented in the Bio.Alignment.BlastXML module.
The format is straightforward (and non-recursive).
For more information on BLAST, check http://www.ncbi.nlm.nih.gov/Education/BLASTinfo/information3.html