module Nokogiri

def parse string, url = nil, encoding = nil, options = nil

Parse an HTML or XML document. +string+ contains the document.
## 
def parse string, url = nil, encoding = nil, options = nil
  doc =
    if string.respond_to?(:read) ||
      string =~ /^\s*<[^Hh>]*html/i # Probably html
      Nokogiri.HTML(
        string,
        url,
        encoding, options || XML::ParseOptions::DEFAULT_HTML
      )
    else
      Nokogiri.XML(string, url, encoding,
                    options || XML::ParseOptions::DEFAULT_XML)
    end
  yield doc if block_given?
  doc
end