diff --git a/nodes/Node.cc b/nodes/Node.cc
index 9ea6bd3..6999caf 100644
--- a/nodes/Node.cc
+++ b/nodes/Node.cc
@@ -17,6 +17,16 @@ void Node::addChildren(refptr<Node> other)
     }
 }
 
+void Node::process(FILE * out)
+{
+    for (vector< refptr<Node> >::const_iterator it = m_children.begin();
+         it != m_children.end();
+         it++)
+    {
+        (*it)->process(out);
+    }
+}
+
 Node::~Node()
 {
 }
diff --git a/nodes/Node.h b/nodes/Node.h
index c51f0a4..87c5a14 100644
--- a/nodes/Node.h
+++ b/nodes/Node.h
@@ -19,7 +19,7 @@ class Node
         virtual double getDouble() { return m_double; }
         virtual uint64_t getInteger() { return m_integer; }
         virtual std::string getString() { return m_string; }
-        virtual void process(FILE * out) { }
+        virtual void process(FILE * out);
 
     protected:
         std::vector< refptr<Node> > m_children;