Force-Directed Layout from XML by mbostock

index.html

<!DOCTYPE html>
<style>

.link line {
  stroke: #aaa;
}

.node circle {
  pointer-events: all;
  stroke: none;
  stroke-width: 40px;
}

</style>
<svg width="960" height="500"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>

var svg = d3.select("svg"),
    width = +svg.attr("width"),
    height = +svg.attr("height");

var radius = d3.scaleSqrt()
    .domain([0, 20000])
    .range([0, 20]);

var link = svg.append("g")
    .attr("class", "link")
  .selectAll("line");

var node = svg.append("g")
    .attr("class", "node")
  .selectAll("circle");

var drag = d3.drag()
    .on("start", dragstarted)
    .on("drag", dragged)
    .on("end", dragended);

var simulation = d3.forceSimulation()
    .force("link", d3.forceLink())
    .force("charge", d3.forceManyBody())
    .force("center", d3.forceCenter(width / 2, height / 2))
    .on("tick", ticked)
    .stop();

d3.xml("flare.xml", function(error, document) {
  if (error) throw error;

  var nodes = d3.select(document).selectAll("*").nodes(),
      links = nodes.slice(1).map(function(d) { return {source: d, target: d.parentNode}; });

  link = link.data(links).enter().append("line");

  node = node.data(nodes).enter().append("circle")
      .attr("r", function(d) { return radius(d.textContent) || 5; })
      .call(drag);

  node.append("title")
      .text(function(d) { return d.tagName; });

  simulation.nodes(nodes);
  simulation.force("link").links(links);
  simulation.restart();
});

function ticked() {
  link
      .attr("x1", function(d) { return d.source.x; })
      .attr("y1", function(d) { return d.source.y; })
      .attr("x2", function(d) { return d.target.x; })
      .attr("y2", function(d) { return d.target.y; });

  node
      .attr("cx", function(d) { return d.x; })
      .attr("cy", function(d) { return d.y; });
}

function dragstarted(d) {
  if (!d3.event.active) simulation.alphaTarget(0.3).restart();
  d.fx = d.x, d.fy = d.y;
}

function dragged(d) {
  d.fx = d3.event.x, d.fy = d3.event.y;
}

function dragended(d) {
  if (!d3.event.active) simulation.alphaTarget(0);
  d.fx = null, d.fy = null;
}

</script>

flare.xml

<?xml version="1.0" encoding="ISO-8859-1"?>
<flare>
  <analytics>
     <cluster>
        <agglomerativeCluster>3938</agglomerativeCluster>
        <communityStructure>3812</communityStructure>
        <mergeEdge>743</mergeEdge>
     </cluster>
     <graph>
        <test>3343</test>
        <mmmm>3353</mmmm>
        <lalala>454</lalala>
     </graph>
     <optimization>
        <AspectRatio>7074</AspectRatio>
     </optimization>
  </analytics>
</flare>