diff -r 67d6dceb1002 -r 40cabcdcd2be samples/visitor/21-clientprovider/src-api1.0/org/apidesign/visitor/Language.java
--- a/samples/visitor/21-clientprovider/src-api1.0/org/apidesign/visitor/Language.java	Sat Jun 14 09:59:20 2008 +0200
+++ b/samples/visitor/21-clientprovider/src-api1.0/org/apidesign/visitor/Language.java	Thu Oct 30 21:30:10 2014 +0100
@@ -18,11 +18,11 @@
     public static abstract class Visitor {
         Visitor() {}
 
-        public static Visitor create(Version1_0 v) {
-            return create1_0(v);
+        public static Visitor create(Version10 v) {
+            return create10(v);
         }
 
-        public interface Version1_0 {
+        public interface Version10 {
             public boolean visitUnknown(Expression e);
             public void visitPlus(Plus s);
             public void visitNumber(Number n);
@@ -33,7 +33,7 @@
     }
     // END: visitor.clientprovider.v1
     
-    static Visitor create1_0(final Visitor.Version1_0 v) {
+    static Visitor create10(final Visitor.Version10 v) {
         return new Visitor() {
             @Override
             public void dispatchPlus(Plus p) {