query: SELECT DISTINCT ?item ?source ?namedas WHERE {
      ?item p:P973 ?describedAt .
      ?describedAt ps:P973 ?source .
      OPTIONAL {
        ?describedAt pq:P1810 ?namedas .
      }
      FILTER(CONTAINS(LCASE(STR(?source)), "democracy.leeds.gov.uk/"))
  }
  ORDER BY ?namedas