"""Sequence input/output designed to look similar to the bioperl design.

At present, these are all hand written.  I would like to have
autogenerated parsers in the futures, esp. with the ability to parse
only subsets of the data, and to support event generated parsers.

Note that once a parser is given an input string, it is free to read
as much of the data as it wants to read, unless otherwise mentioned.
"""
