code: function lazyBuildObjectTree(priv, formatted) {
    definePropertyGetters(formatted, {
      children: lazy(function() { return priv.fqnMap.getChildrenOf(formatted.fqn); }),
      fields: lazy(function() { return formatted.children.filter(Filter.ofType('property')); }),
      methods: lazy(function() { return formatted.children.filter(Filter.ofType('function')); }),
      parent: lazy(function() { return priv.fqnMap.getParentOf(formatted.fqn); }),
      parentElement: lazy(function() { return priv.fqnMap.get(formatted.idTags['parent-element']); }),
    });
  }
docs: sets parent->child relations