====== Project graph ======

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The project graph is stored in an XML file to represent the current state of the project. The minimal content of the **graph** is:

<code xml>
<?xml version="1.0" encoding="UTF-8"?>
<graph xmlns="http://grogra.de/xmlpersistence" xmlns:gx="http://grogra.de/xmlpersistence"/>
</code>  

The first line is the required xml description. The second contains the main tag of the file: ''<graph/>''. It also needs to define the xmlns attributes used by GroIMP to load the content described in the file.

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An actual **graph** (with only the rggroot) can look like:

<code xml>
<?xml version="1.0" encoding="UTF-8"?><graph xmlns="http://grogra.de/xmlpersistence" xmlns:gx="http://grogra.de/xmlpersistence">

<!-- The first root: the meta graph -->
 <node root="MetaGraph" id="1" type="de.grogra.graph.impl.Node">
  <data gx:name="extentIndex" gx:value="7"/>
  <node id="29" type="Model" edges="+">
   <data gx:name="extentIndex" gx:value="7"/>
   <object gx:name="initialTurtleState" color="14" length="100.0" diameter="0.1" tropism="0.0" parameter="0.0" carbon="0.0" heartwood="0.0" internodeCount="0"/>
  </node>
 </node>

<!-- The second root -->
 <node root="MainGraph" id="0" type="de.grogra.graph.impl.Node">
  <data gx:name="extentIndex" gx:value="7"/>
  <node id="21" type="de.grogra.rgg.RGGRoot" edges="+"/>
 </node>
</graph>
</code>

Notice that, with this representation, successor edges are implicitly described. The first node under another ''<node/>'' tag is seen as the successor. Additional edges would be added as ''<edge/>'' tags.