Index: Modules.dox
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--- Modules.dox	(revision 21972)
+++ Modules.dox	(working copy)
@@ -17,6 +17,29 @@
 */
 
 /**
+  \defgroup PSIO PointSet IO
+  \ingroup IO
+
+  \brief The PointSet IO category includes the classes mitk::PointSetWriter and mitk::PointSetReader and mitk::PointSet.
+  
+  Pointsets which are created by the PointSetWriter appear in the follow way: <br>
+  <img src="PointSetWriterDoc.jpg" alt="PointSet Output" /><br>
+  
+  A 4D pointset means a pointset with at least one Point with 3 space coordinates (x, y, z) and 1 time coordinate.
+    
+  It is not Possible to create 3D PointSets, because at least one time series is always included. So 3D pointsets are subsets of 4D pointsets
+  because a 3D pointset is a 4D pointset with only one timeseries.
+ 
+  3D Points can be set in different timeseries which expands the 3D pointset to a 4D pointset.
+  
+  The time coordinate is typified by the XML_TIME_SERIES_ID which makes a differentation between the Points in one timeseries.
+  
+  The attribute XML_TIME_SERIES_ID specifies the continuous ID of a timestep in a Pointset and means.
+  
+  The attribute XML_SPEC specifies a kind of a Point form by using integers. Currently there is only one form available.
+*/
+
+/**
   \defgroup DataStorage Data Storage Classes
   \ingroup DataManagement
 
Index: PointSetWriterDoc.JPG
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