Added Extension meta-class + updated FoundationConcepts diagram.

TestDescriptionLanguage/tdl.uml

@@ -146,6 +146,16 @@
             <upperValue xmi:type="uml:LiteralUnlimitedNatural" xmi:id="_u9P_1lR0EeSGV_4El4z6Og" value="1"/>
           </ownedEnd>
         </packagedElement>
+        <packagedElement xmi:type="uml:Class" xmi:id="_Lp3BcEQEEeqBvYJaFSFI5A" name="Extension" isAbstract="true">
+          <generalization xmi:type="uml:Generalization" xmi:id="_sn2TMEQJEeqBvYJaFSFI5A" general="_oFvnIM5xEeKBmZvNr53Zng"/>
+          <ownedAttribute xmi:type="uml:Property" xmi:id="_gpbyskQEEeqBvYJaFSFI5A" name="extends" type="_oFvnIM5xEeKBmZvNr53Zng" association="_gpbLoEQEEeqBvYJaFSFI5A"/>
+        </packagedElement>
+        <packagedElement xmi:type="uml:Association" xmi:id="_gpbLoEQEEeqBvYJaFSFI5A" memberEnd="_gpbyskQEEeqBvYJaFSFI5A _gpcZwUQEEeqBvYJaFSFI5A">
+          <eAnnotations xmi:type="ecore:EAnnotation" xmi:id="_gpbysEQEEeqBvYJaFSFI5A" source="org.eclipse.papyrus">
+            <details xmi:type="ecore:EStringToStringMapEntry" xmi:id="_gpbysUQEEeqBvYJaFSFI5A" key="nature" value="UML_Nature"/>
+          </eAnnotations>
+          <ownedEnd xmi:type="uml:Property" xmi:id="_gpcZwUQEEeqBvYJaFSFI5A" name="extension" type="_Lp3BcEQEEeqBvYJaFSFI5A" association="_gpbLoEQEEeqBvYJaFSFI5A"/>
+        </packagedElement>
       </packagedElement>
       <packagedElement xmi:type="uml:Package" xmi:id="_7URIQOy_EeKqo4Ny4D-vKA" name="Data">
         <packagedElement xmi:type="uml:Package" xmi:id="_R1-b8HlFEeSVko5r_SJ_NA" name="DataDefinition">
@@ -2121,4 +2131,5 @@
   <Ecore:EEnumLiteral xmi:id="_ZLFjYNaJEeedNORd7vYpsg" base_EnumerationLiteral="_ZLDHIdaJEeedNORd7vYpsg"/>
   <Ecore:EAttribute xmi:id="_x3vqYNaJEeedNORd7vYpsg" base_Property="_x3t1MNaJEeedNORd7vYpsg"/>
   <standard:Metaclass xmi:id="_ySkqgEN-Eeq6JfofCdGheg" base_Class="_ySa5gEN-Eeq6JfofCdGheg"/>
+  <standard:Metaclass xmi:id="_LqALYEQEEeqBvYJaFSFI5A" base_Class="_Lp3BcEQEEeqBvYJaFSFI5A"/>
 </xmi:XMI>