Playground-Fredy.md

@@ -74,3 +74,9 @@ Then it's possible to provide services by each platform to ask if a tag is verif
 
 # address, legalAddress, contacts
 There is not really a matching for adresses. [Profile](https://www.w3.org/TR/activitystreams-vocabulary/#dfn-profile) has a property [describes](https://www.w3.org/TR/activitystreams-vocabulary/#dfn-describes). But we should not exchange address data, we should maybe only link to the profile page of the actor.
+
+# opening hours
+TODO, maybe https://schema.org/OpeningHoursSpecification
+
+# additionalProperty
+Todo, maybe https://schema.org/additionalProperty
\ No newline at end of file