When serialized, the registry is stored in a XML file. With the extension .gs.

It's minimal content is:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<project xmlns="http://grogra.de/registry" graph="graph.xml"/>

The first line describes the xml format. Then the second line is the main tag of the file: <project/>. All the content of the project registry has to be inserted under this tag. The tag also defines the name of the graph file it describes.

An actual registry file of a project looks like:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<project xmlns="http://grogra.de/registry" graph="graph.xml">
<!-- The list of required groimp plugin for running the project -->
 <import plugin="de.grogra.imp" version="2.1.5"/>
 <import plugin="de.grogra.pf" version="2.1.5"/>
 
<!-- All the registry items required to be loaded --> 
<registry>
<!-- List of the projects objects (Here we only have one file, but shaders, images, ... would be listed here as well) -->
 <ref name="project">
   <ref name="objects">
    <ref name="files">
     <de.grogra.pf.ui.registry.SourceFile mimeType="text/x-grogra-rgg" name="Model.rgg" systemId="pfs:Model.rgg"/>
     </ref>
    </ref>
   </ref>
 
   <!-- A list of the layout used to reload the project in the same workbench layout --> 
   <ref name="workbench">
   <ref name="state">
    <de.grogra.pf.ui.registry.Layout name="layout">
    ...
    </de.grogra.pf.ui.registry.Layout>
   </ref>
  </ref>
 
</registry>
 
</project