diff -r 71a627e72815 -r aeda3cb4528d relpipe-data/principles.xml
--- a/relpipe-data/principles.xml	Mon Jul 27 16:48:40 2020 +0200
+++ b/relpipe-data/principles.xml	Mon Jul 27 17:51:53 2020 +0200
@@ -106,7 +106,7 @@
 		<h2>Optional complexity</h2>
 		
 		<p>
-			We are not scared by things like XML, SQL, Java or even C++ and we do not hate them.
+			We are not scared by things like XML, SQL, RDF, Java or even C++ and we do not hate them.
 			There are use cases where their complexity is reasonable and makes sense.
 			But on the other hand, there are many scenarios, where such complexity is not necessary or is even harmful.
 			This leads us to the conclusion: <em>the complexity must be optional</em>.