class Nokogiri::XML::NodeSet

def search *paths

Nokogiri::XML::Node#xpath
For more information see Nokogiri::XML::Node#css and

Search this document for +paths+
## 
def search *paths
  handler = ![
    Hash, String, Symbol
  ].include?(paths.last.class) ? paths.pop : nil
  ns = paths.last.is_a?(Hash) ? paths.pop : nil
  sub_set = NodeSet.new(document)
  paths.each do |path|
    sub_set += send(
      path =~ /^(\.\/|\/|\.\.|\.$)/ ? :xpath : :css,
      *(paths + [ns, handler]).compact
    )
  end
  document.decorate(sub_set)
  sub_set
end