/**
 * This function coverts a DOM Tree into JavaScript Object.
 * @param srcDOM: DOM Tree to be converted.
 */
function xml2json(srcDOM) {
    let children = [...srcDOM.children];

    // base case for recursion.
    if (!children.length) {
      return srcDOM.innerHTML
    }

    // initializing object to be returned.
    let jsonResult = {};

    for (let child of children) {

      // checking is child has siblings of same name.
      let childIsArray = children.filter(eachChild => eachChild.nodeName === child.nodeName).length > 1;

      // if child is array, save the values as array, else as strings.
      if (childIsArray) {
        if (jsonResult[child.nodeName] === undefined) {
          jsonResult[child.nodeName] = [xml2json(child)];
        } else {
          jsonResult[child.nodeName].push(xml2json(child));
        }
      } else {
        jsonResult[child.nodeName] = xml2json(child);
      }
    }

    return jsonResult;
  }