minor changes

src/main/java/org/wahlzeit/model/PhotoManager.java

@@ -148,7 +148,7 @@ protected Photo doGetPhotoFromId(PhotoId id) {
     }
 
     /**
-     *
+     * this.getPhotoFromID -> this.readObject -> this.createObject
      */
     protected Photo createObject(ResultSet rset) throws SQLException {
         return PhotoFactory.getInstance().createPhoto(rset);

src/main/java/org/wahlzeit/model/PhotoUtil.java

@@ -108,7 +108,7 @@ protected static void assertIsValidImage(Image image) {
 	}
 
 	/**
-	 * 
+	 * @methodtype assertion
 	 */
 	protected static void assertHasValidSize(int cw, int ch) {
 		if (PhotoSize.THUMB.isWiderAndHigher(cw, ch)) {

src/main/java/org/wahlzeit/model/landscape/LandscapeType.java

@@ -50,6 +50,9 @@ public LandscapeType getSuperType() {
     }
 
 
+    /**
+     * Tests whether one type is a subtype of another. Any type is considered to be a subtype of itself.
+     */
     public boolean isSubtype(LandscapeType superType){
         AssertArgument.notNull(superType);
         return doIsSubtype(superType);

src/test/java/org/wahlzeit/model/landscape/LandscapeTypeTest.java

@@ -26,6 +26,9 @@ public void testIsSubtype() {
         LandscapeType alps = LandscapeManager.getLandscapeType("alps", mountains);
         LandscapeType zugspitze = LandscapeManager.getLandscapeType("zugspitze", alps);
 
+        // Any type is considered to be a subtype of itself.
+        assertTrue(generalLandscape.isSubtype(generalLandscape));
+        assertTrue(alps.isSubtype(alps));
 
         assertTrue(alps.isSubtype(mountains));
         assertTrue(zugspitze.isSubtype(mountains));