This is the Boulder IO package.

Boulder provides a simple stream-oriented format for transmitting data
objects between one or more processes.  It does not provide for the
serialization of Perl objects the way FreezeThaw or Data::Dumper do,
but it does provide the advantage of being language independent.

In addition to a stream-oriented interface, Boulder comes with a
simple record-oriented database-oriented interface, Boulder::Store,
which provides query and search capabilities comparable to many flat
file DBMS systems.