diff --git a/rdf/README.md b/rdf/README.md
new file mode 100644
index 0000000..48e75b4
--- /dev/null
+++ b/rdf/README.md
@@ -0,0 +1,34 @@
+---
+gitea: none
+include_toc: true
+---
+# RDF
+
+## Various
+
+### Declare a default namespace
+
+it will be working just with a `:`:
+
+``` turtle
+PREFIX : <http://abc.rutishauser.info/xyz/>
+
+:Bugs_Bunny :name "Bugs Bunny" .
+```
+
+### short form for rdf:type
+
+rdf:type is a property `<http://www.w3.org/1999/02/222-rdf-syntax-ns#type>` and is usually shortened to `a`.
+
+### Literal Datatypes
+
+^Serialization^Datatype^
+|"Bugs Bunny"|xsd:string|
+|"Bugs Bunny"%%^^%%xsd:string|xsd:string|
+|"Bugs Bunny"@en|rdf:langstring|
+|"1940-07-27"%%^^%%xsd:date|xsd:date|
+|"1940-07-27T01:00:00.000Z"%%^^%%xsd:date|xsd:dateTime|
+|101|xsd:integer|
+|2.0|xsd:decimal|
+|True|xsd:boolean|
+
diff --git a/tls-ssl/README.md b/tls-ssl/README.md
index 4a18c64..9bbc082 100644
--- a/tls-ssl/README.md
+++ b/tls-ssl/README.md
@@ -6,7 +6,8 @@ include_toc: true
 
 Übersicht: https://www.sslmarket.ch/ssl/formate-von-ssl-zertifikaten-und-ihre
 
-## cacerts / jave
+## cacerts / java
+
 ## Neues Zertifikat in cacerts einfügen
 
 ```