function collectedHist = attachToDom(obj, dom, parent, collectedHist)
  
  collectedHist = attachToDom@ltpda_data(obj, dom, parent, collectedHist);
  
  % Add xunits
  if isa(obj.xunits, 'unit')
    xunitsNode = dom.createElement('xunits');
    collectedHist = obj.xunits.attachToDom(dom, xunitsNode, collectedHist);
    parent.appendChild(xunitsNode);
  end
  
  % Add x
  xNode = dom.createElement('x');
  utils.xml.attachNumberToDom(obj.x, dom, xNode)
  parent.appendChild(xNode);
  
  % Add dx
  dxNode = dom.createElement('dx');
  utils.xml.attachNumberToDom(obj.dx, dom, dxNode)
  parent.appendChild(dxNode);
  
end