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<chapter xmlns:xi="http://www.w3.org/2001/XInclude">
<title>Abstract Data Representation</title>

<para>
The data model used by <command>rad</command> is known as the Abstract
Data Representation (<acronym>ADR</acronym>).  <acronym>ADR</acronym>
takes the concepts discussed in the previous chapter and (contrary to
its name) makes them concrete by defining a formal
<acronym>IDL</acronym> for describing types and
interfaces; by supplying a toolchain for operating on that
<acronym>IDL</acronym>; and by providing libraries used by
<command>rad</command>, its extension modules, and its clients.
</para>

<xi:include href="c-adr-idl.xml" />
<xi:include href="c-adr-radadrgen.xml" />

</chapter>