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title: Module Organization
--- name:overview

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# Module Organization

ActiveMQ OpenWire is composed of many loosely coupled jar files.  This helps
maintain a clear separations of concerns between the modules and allows
end users to end up with smaller footprint configurations if they don't
need all the optional features of the project.

## OpenWire Core

The core library contains the OpenWire Command objects and a set marshalers that
implement the initial 1.0 OpenWire protocol as well as the two most recent version
marshalers for the protocol.  This allows for a small library to be used when you
only need to talk to the most up to date Broker instances.

## OpenWire Legacy

The module provides all remaining protocol marshalers for versions of OpenWire that
are no longer in common use.  If you need to communicate with an older broker instance
then you might need to include this library in order to communicate properly.