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d3_selectionPrototype.select = function(selector) {
  var subgroups = [],
      subgroup,
      subnode,
      group,
      node;

  if (typeof selector !== "function") selector = d3_selection_selector(selector);

  for (var j = -1, m = this.length; ++j < m;) {
    subgroups.push(subgroup = []);
    subgroup.parentNode = (group = this[j]).parentNode;
    for (var i = -1, n = group.length; ++i < n;) {
      if (node = group[i]) {
        subgroup.push(subnode = selector.call(node, node.__data__, i));
        if (subnode && "__data__" in node) subnode.__data__ = node.__data__;
      } else {
        subgroup.push(null);
      }
    }
  }

  return d3_selection(subgroups);
};

function d3_selection_selector(selector) {
  return function() {
    return d3_select(selector, this);
  };
}
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