- fixed missing licences of some semantic resources

  - changed "schema.org" to http in instead of https

src/soil/semantics.py

@@ -43,7 +43,7 @@ class Namespaces(object):
     quantitykind = rdflib.Namespace('http://qudt.org/vocab/quantitykind/')
     qudt = rdflib.Namespace('http://qudt.org/schema/qudt/')
     rdf = rdflib.namespace.RDF
-    schema = rdflib.Namespace('https://schema.org/')
+    schema = rdflib.Namespace('http://schema.org/')
     si = rdflib.Namespace('https://ptb.de/si/')
     soil = rdflib.Namespace('https://purl.org/fair-sensor-services/soil#')
     sosa = rdflib.namespace.SOSA