diff --git a/src/main/cljc/org/domaindrivenarchitecture/activity_pub_poc/activitystreams2.cljc b/src/main/cljc/org/domaindrivenarchitecture/activity_pub_poc/activitystreams2.cljc
new file mode 100644
index 0000000..9114f18
--- /dev/null
+++ b/src/main/cljc/org/domaindrivenarchitecture/activity_pub_poc/activitystreams2.cljc
@@ -0,0 +1,14 @@
+(ns org.domaindrivenarchitecture.activity-pub-poc.activitystreams2
+  (:require [clojure.spec.alpha :as s]
+            [org.domaindrivenarchitecture.activity-pub-poc.owl :as owl]
+            [org.domaindrivenarchitecture.activity-pub-poc.core :as core]))
+
+;http://www.w3.org/ns/activitystreams#id
+;TODO: how do we translate this? rdfs:domain [a owl:Class ;    owl:unionOf (as:Link as:Object)]
+; Der token 'a' in einer ttl definition entspricht dem RDF-Prädikat rdf:type.
+; Siehe: https://www.w3.org/TR/turtle/#sec-iri   UND   https://www.w3.org/TR/rdf12-schema/#ch_type
+; => (R, rdf:type, C) => C instanceof rdfs:Class & R instanceof C
+(s/def ::id (s/and ::owl/FunctionalProperty
+                   ::owl/DatatypeProperty
+                   ::owl/DeprecatedProperty
+                   core/uri-string?))
\ No newline at end of file
diff --git a/src/main/cljc/org/domaindrivenarchitecture/activity_pub_poc/owl.cljc b/src/main/cljc/org/domaindrivenarchitecture/activity_pub_poc/owl.cljc
index a78c43d..cb1a30a 100644
--- a/src/main/cljc/org/domaindrivenarchitecture/activity_pub_poc/owl.cljc
+++ b/src/main/cljc/org/domaindrivenarchitecture/activity_pub_poc/owl.cljc
@@ -5,7 +5,7 @@
 
 ; Properties:https://www.w3.org/TR/owl-ref/#Property
 ; * Datatype properties link individuals to data values.
-; * Object properties link individuals to data values.
+; * Object properties link individuals to individuals.
 
 ;http://www.w3.org/2002/07/owl#DatatypeProperty
 (s/def ::DatatypeProperty any?)
diff --git a/src/main/cljc/org/domaindrivenarchitecture/activity_pub_poc/predicates.cljc b/src/main/cljc/org/domaindrivenarchitecture/activity_pub_poc/predicates.cljc
new file mode 100644
index 0000000..2973182
--- /dev/null
+++ b/src/main/cljc/org/domaindrivenarchitecture/activity_pub_poc/predicates.cljc
@@ -0,0 +1,6 @@
+(ns org.domaindrivenarchitecture.activity-pub-poc.predicates
+  (:require [clojure.string :as str]))
+
+(defn uri-string? [input]
+  (and (string? input)
+       (re-matches #"\w+:(\/?\/?)[^\s]+" input)))
\ No newline at end of file
diff --git a/src/main/cljc/org/domaindrivenarchitecture/activity_pub_poc/rdf.cljc b/src/main/cljc/org/domaindrivenarchitecture/activity_pub_poc/rdf.cljc
new file mode 100644
index 0000000..a2d6173
--- /dev/null
+++ b/src/main/cljc/org/domaindrivenarchitecture/activity_pub_poc/rdf.cljc
@@ -0,0 +1,12 @@
+(ns org.domaindrivenarchitecture.activity-pub-poc.rdf
+  "" "A swallow spec translation implementation of rdf. Inheritance of FunctionalProperty 
+     is realized in deep implemented." ""
+  (:require [clojure.spec.alpha :as s]
+            [orchestra.core :refer [defn-spec]]))
+
+; TODO: Fill out logic
+(defn-spec triple boolean?
+  [rdf-types any?
+   property any?
+   object any?]
+  )
\ No newline at end of file
diff --git a/src/main/cljc/org/domaindrivenarchitecture/activity_pub_poc/rdfs.cljc b/src/main/cljc/org/domaindrivenarchitecture/activity_pub_poc/rdfs.cljc
new file mode 100644
index 0000000..bebcc7d
--- /dev/null
+++ b/src/main/cljc/org/domaindrivenarchitecture/activity_pub_poc/rdfs.cljc
@@ -0,0 +1,15 @@
+(ns org.domaindrivenarchitecture.activity-pub-poc.rdfs
+  "" "A swallow spec translation implementation of rdfs. Inheritance of FunctionalProperty 
+     is realized in deep implemented." ""
+  (:require [clojure.spec.alpha :as s]))
+
+;https://www.w3.org/TR/rdf12-schema/#ch_range
+; "P rdfs:range C" indicates that:
+; 1. P is an instance of the class rdf:Property
+; 2. C is an instance of the class rdfs:Class 
+; 3. all the resources denoted by the objects of triples whose predicate is P are instances of the class C.
+;   =>Bedeutet(?): Es gilt: Tupel = (Subjekt, Prädikat, Objekt):
+;                  => Wenn (P, rdfs:range, C) & (S, P, C2) => C2 is instance of C
+;
+; 1. und 2. könnten wir in der spec abbilden. 3. brauchen wir vmtl nicht (und hab ich nicht 100% verstanden)
+(s/def ::range any?)
\ No newline at end of file
diff --git a/src/main/cljc/org/domaindrivenarchitecture/activity_pub_poc/xsd.cljc b/src/main/cljc/org/domaindrivenarchitecture/activity_pub_poc/xsd.cljc
new file mode 100644
index 0000000..021697f
--- /dev/null
+++ b/src/main/cljc/org/domaindrivenarchitecture/activity_pub_poc/xsd.cljc
@@ -0,0 +1,8 @@
+(ns org.domaindrivenarchitecture.activity-pub-poc.xsd
+  "" "A swallow spec translation implementation of xsd Inheritance of FunctionalProperty 
+     is realized in deep implemented." ""
+  (:require [clojure.spec.alpha :as s]
+            [org.domaindrivenarchitecture.activity-pub-poc.predicates :as p]))
+
+;https://www.w3.org/TR/xmlschema11-2/#anyURI
+(s/def ::anyURI p/uri-string?)
\ No newline at end of file