First step of refactoring code (ccnx prefix => ndn prefix)
diff --git a/helper/ccnb-parser/visitors/ccnb-parser-void-no-argu-visitor.h b/helper/ccnb-parser/visitors/ccnb-parser-void-no-argu-visitor.h
index 90aee97..25f9e50 100644
--- a/helper/ccnb-parser/visitors/ccnb-parser-void-no-argu-visitor.h
+++ b/helper/ccnb-parser/visitors/ccnb-parser-void-no-argu-visitor.h
@@ -27,7 +27,7 @@
 namespace CcnbParser {
 
 /**
- * \ingroup ccnx-ccnb
+ * \ingroup ndn-ccnb
  * \brief Visitor interface that takes no arguments and returns nothing
  *
  * \see http://www.ccnx.org/releases/latest/doc/technical/BinaryEncoding.html