Data Api Access

https://datos.madrid.es/id/api/3/action/datastore_search?resource_id=300322-2-oficinas-contribuyente-csv&limit=5

https://datos.madrid.es/id/api/3/action/datastore_search?resource_id=300322-2-oficinas-contribuyente-csv&q=jones

A simple ajax (JSONP)

        var data = {
          resource_id: '300322-2-oficinas-contribuyente-csv', // the resource id
          limit: 5, // get 5 results
          q: 'jones' // query for 'jones'
        };
        $.ajax({
          url: 'https://datos.madrid.es/id/api/3/action/datastore_search',
          data: data,
          dataType: 'jsonp',
          success: function(data) {
            alert('Total results found: ' + data.result.total)
          }
        });

      import urllib
      url = 'https://datos.madrid.es/id/api/3/action/datastore_search?resource_id=300322-2-oficinas-contribuyente-csv&limit=5&q=title:jones'  
      fileobj = urllib.urlopen(url)
      print fileobj.read()