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<sect2 id="sect.Geom.Persistency">
<title>
Saving geometry tree objects in binary format
</title>

<para>
The Geant4 geometry tree can be stored in the Root binary file format
using the <emphasis>reflection</emphasis> technique provided by the
Reflex tool (included in Root). Such a binary file can then be used
to quickly load the geometry into the memory or to move geometries
between different Geant4 applications.
</para>
<para>
See <ulink url="http://cern.ch/geant4/UserDocumentation/UsersGuides/ForApplicationDeveloper/html/ch04s06.html">Chapter 4.6</ulink>
for details and references.
</para>

</sect2>
