Index: DamEngine/trunk/xsd/DamSoil.xsd
===================================================================
diff -u -r4417 -r4560
--- DamEngine/trunk/xsd/DamSoil.xsd	(.../DamSoil.xsd)	(revision 4417)
+++ DamEngine/trunk/xsd/DamSoil.xsd	(.../DamSoil.xsd)	(revision 4560)
@@ -1,7 +1,11 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!-- Created with Liquid XML Studio 1.0.8.0 (http://www.liquid-technologies.com) -->
 <xs:schema elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
+  <xs:include schemaLocation=".\DamSigmaTauCurve.xsd" />
   <xs:complexType name="Soil">
+    <xs:sequence minOccurs="0" maxOccurs="1">
+      <xs:element name="SigmaTauCurve" type="SigmaTauCurve" />
+    </xs:sequence>
     <xs:attribute name="Name" type="xs:string" use="required" />
     <xs:attribute name="BeddingAngle" type="xs:double" use="optional" />
     <xs:attribute name="DiameterD70" type="xs:double" use="optional" />
@@ -16,6 +20,7 @@
         <xs:restriction base="xs:string">
           <xs:enumeration value="CPhi" />
           <xs:enumeration value="SuCalculated" />
+          <xs:enumeration value="SigmaTauCurve" />
         </xs:restriction>
       </xs:simpleType>
     </xs:attribute>
Index: DamEngine/trunk/xsd/DamInput.xsd
===================================================================
diff -u -r3663 -r4560
--- DamEngine/trunk/xsd/DamInput.xsd	(.../DamInput.xsd)	(revision 3663)
+++ DamEngine/trunk/xsd/DamInput.xsd	(.../DamInput.xsd)	(revision 4560)
@@ -12,6 +12,7 @@
   <xs:include schemaLocation=".\DamSensor.xsd" />
   <xs:include schemaLocation=".\DamSensorLocation.xsd" />
   <xs:include schemaLocation=".\DamSensorGroup.xsd" />
+  <xs:include schemaLocation=".\DamSigmaTauCurve.xsd" />
   <xs:complexType name="Input">
     <xs:sequence>
       <xs:element name="Locations">
Index: DamEngine/trunk/xsd/DamSigmaTauCurve.xsd
===================================================================
diff -u
--- DamEngine/trunk/xsd/DamSigmaTauCurve.xsd	(revision 0)
+++ DamEngine/trunk/xsd/DamSigmaTauCurve.xsd	(revision 4560)
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Created with Liquid XML Studio 1.0.8.0 (http://www.liquid-technologies.com) -->
+<xs:schema elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
+  <xs:complexType name="SigmaTauCurve">
+    <xs:sequence>
+      <xs:element minOccurs="2" maxOccurs="unbounded" name="SigmaTauPoint">
+        <xs:complexType>
+          <xs:attribute name="Sigma" type="xs:double" use="required" />
+          <xs:attribute name="Tau" type="xs:double" use="required" />
+        </xs:complexType>
+      </xs:element>
+    </xs:sequence>
+  </xs:complexType>
+</xs:schema>
\ No newline at end of file