docs: def expand(self, id):
          """ Expand a concept or collection to all it's narrower concepts.
              If the id passed belongs to a :class:`skosprovider.skos.Concept`,
              the id of the concept itself should be include in the return value.
  
          :param str id: A concept or collection id.
          :returns: A :class:`lst` of id's. Returns false if the input id does not exists
          """
  
          query = """SELECT DISTINCT ?Id{
                  {
                  ?Subject dc:identifier ?Id; skos:inScheme %s:; gvp:broaderExtended %s;.
                  }
                  UNION
                  {
                  VALUES ?Id {'%s'}
                  ?Subject dc:identifier ?Id; skos:inScheme %s:; rdf:type skos:Concept.
                  }
                  }
                  """ % (self.vocab_id, self.vocab_id + ":" + id, id, self.vocab_id)
  
          print (query)
          res = self.session.get(self.base_url + "sparql.json", params={"query": query})
          res.encoding = 'utf-8'
          r = res.json()
  
          result = [result['Id']['value'] for result in r['results']['bindings']]
          if len(result) == 0 and self.get_by_id(id) is False:
              return False
          return result