--- a/flys-artifacts/ChangeLog	Fri Jul 01 14:46:13 2011 +0000
+++ b/flys-artifacts/ChangeLog	Sun Jul 03 15:33:33 2011 +0000
@@ -1,3 +1,42 @@
+2011-07-03  Sascha L. Teichmann <sascha.teichmann@intevation.de>
+
+	Added the math needed to calculate "W-Differenzen" in "Laengsschnitten".
+	Needs testing!
+
+	* src/main/java/de/intevation/flys/artifacts/model/NamedObject.java:
+	  Made it an interface to be usable in more than one inheritance chain.
+
+	* src/main/java/de/intevation/flys/artifacts/model/NamedObjectImpl.java:
+	  Implements the NamedObject interface and is the new base class of
+	  WQ and WKmsImpl.
+
+	* src/main/java/de/intevation/flys/artifacts/model/WKms.java:
+	  New. Interface to associate kms with ws.
+
+	* src/main/java/de/intevation/flys/artifacts/model/WQKms.java:
+	  Changed the base class to NamedObjectImpl. Renamed getKms(int)
+	  to getKm(int) to make clear it return a single scalar value
+	  and fullfil the WKms interface.
+
+	* src/main/java/de/intevation/flys/artifacts/model/WKmsImpl.java:
+	  New. Implements the WKms interface. Intended to be a lightweight
+	  datastore for "zusaetzliche Laengsschnitte" and as results
+	  of the WKmsOperations.
+
+	* src/main/java/de/intevation/flys/artifacts/model/WQ.java:
+	  Changed base class to NamedObjectImpl.
+
+	* src/main/java/de/intevation/flys/artifacts/math/WKmsOperation.java:
+	  New. Operations on WKms data.
+	  Currently only the SUBTRACTION operation is implemented. This
+	  one is needed to calculate the "W-Differenzen". The operation
+	  is insensitive about the km directions of the datasets. Missing
+	  values are interpolated linear.
+
+	* src/main/java/de/intevation/flys/exports/DischargeLongitudinalSectionGenerator.java,
+	  src/main/java/de/intevation/flys/exports/LongitudinalSectionGenerator.java:
+	  Adjusted to satisfy the signature change of WQKMs.
+
 2011-07-01  Ingo Weinzierl <ingo@intevation.de>
 
 	* src/main/java/de/intevation/flys/exports/StyledXYSeries.java: New. This
@@ -96,7 +135,7 @@
 	* pom.xml: Downgraded Trove to 1.1-beta-5, because the new
 	  later ones are removed from the maven repos.
 
-	  The functionality we need is in 1.1 so this downgrad should
+	  The functionality we need is in 1.1 so this downgrade should
 	  cause no problems.
 
 	  Would be nice if we would support the maintainers of trove to