<div id="app">
  <l-map :bounds="bounds" style="position: absolute; top: 0;right: 0; bottom: 0; left: 0;">
    <l-tile-layer :url="tileurl"></l-tile-layer>
    <l-marker v-for="item in items" :lat-lng="{lat: item.lat.value, lon: item.long.value }">
      <l-popup>
        <a :href="item.uri.value" target="_blank" rel="noreferrer noopener">
          {{ item.label.value }}
        </a>
      </l-popup>
    </l-marker>
  </l-map>
</div>

Vue.component("l-map", window.Vue2Leaflet.LMap);
Vue.component("l-tile-layer", window.Vue2Leaflet.LTileLayer);
Vue.component("l-marker", window.Vue2Leaflet.LMarker);
Vue.component("l-popup", window.Vue2Leaflet.LPopup);
new Vue({
  el: "#app",
  data() {
    return {
      items: [],
      tileurl: "https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png",
      bounds: null
    };
  },
  mounted() {
    var self = this;
    axios
      .get("https://jpsearch.go.jp/rdf/sparql/", {
        params: {
          query: `
                SELECT DISTINCT ?uri ?label ?category ?date ?pref ?lat ?long WHERE {
                  ?uri rdfs:label ?label ;
                       rdf:type type:建築 ;
                       schema:spatial place:京都 ;
                       jps:spatial/jps:value/rdfs:label ?pref ;
                       schema:temporal/rdfs:label ?date ;
                       schema:category/rdfs:label ?category ;
                       jps:spatial/schema:geo/schema:latitude ?lat;
                       jps:spatial/schema:geo/schema:longitude ?long;
                       jps:spatial/schema:geo/jps:within+ <http://geohash.org/xn0x1> .
                }
                limit 1000`,
          output: "json"
        }
      })
      .then(function (response) {
        self.items = response.data.results.bindings;
        self.items.forEach(function (item) {
          self.setBounds(item.lat.value, item.long.value);
        });
      })
      .catch(function (error) {
        console.log(error);
      });
  },
  methods: {
    setBounds: function (lat, long) {
      if (!this.bounds)
        this.bounds = [
          [lat, long],
          [lat, long]
        ];
      if (this.bounds[1][0] > lat) this.bounds[1][0] = lat;
      if (this.bounds[0][0] < lat) this.bounds[0][0] = lat;
      if (this.bounds[1][1] > long) this.bounds[1][1] = long;
      if (this.bounds[0][1] < long) this.bounds[0][1] = long;
    }
  }
});