class Nokogiri::HTML::Document

def self.new(*args) # :nodoc:

:nodoc: 
def self.new(*args) # :nodoc:
  uri         = args[0]
  external_id = args[1]
  doc = wrap(LibXML.htmlNewDoc(uri, external_id))
  doc.send :initialize, *args
  doc
end

def self.read_io(io, url, encoding, options) # :nodoc:

:nodoc: 
def self.read_io(io, url, encoding, options) # :nodoc:
  wrap_with_error_handling do
    LibXML.htmlReadIO(IoCallbacks.reader(io), nil, nil, url, encoding, options)
  end
end

def self.read_memory(string, url, encoding, options) # :nodoc:

:nodoc: 
def self.read_memory(string, url, encoding, options) # :nodoc:
  wrap_with_error_handling do
    LibXML.htmlReadMemory(string, string.length, url, encoding, options)
  end
end

def fragment tags = nil

Create a Nokogiri::XML::DocumentFragment from +tags+
### 
def fragment tags = nil
  DocumentFragment.new(self, tags)
end

def meta_encoding

then nil is returned
Get the meta tag encoding for this document. If there is no meta tag,
## 
def meta_encoding
  return nil unless meta = css('meta').find { |node|
    node['http-equiv'] =~ /Content-Type/i
  }
  /charset\s*=\s*([\w\d-]+)/i.match(meta['content'])[1]
end

def meta_encoding= encoding

content tag, nil is returned and the encoding is not set.
Set the meta tag encoding for this document. If there is no meta
## 
def meta_encoding= encoding
  return nil unless meta = css('meta').find { |node|
    node['http-equiv'] =~ /Content-Type/i
  }
  meta['content'] = "text/html; charset=%s" % encoding
  encoding
end

def parse string_or_io, url = nil, encoding = nil, options = XML::ParseOptions::DEFAULT_HTML, &block

Nokogiri::XML::ParseOptions.
Nokogiri::XML::ParseOptions::RECOVER. See the constants in
is a number that sets options in the parser, such as
encoding that should be used when processing the document. +options+
+url+ is resource where this document is located. +encoding+ is the
responds to _read_ and _close_ such as an IO, or StringIO.
Parse HTML. +thing+ may be a String, or any object that
## 
def parse string_or_io, url = nil, encoding = nil, options = XML::ParseOptions::DEFAULT_HTML, &block
  options = Nokogiri::XML::ParseOptions.new(options) if Fixnum === options
  # Give the options to the user
  yield options if block_given?
  if string_or_io.respond_to?(:encoding)
    encoding ||= string_or_io.encoding.name
  end
  if string_or_io.respond_to?(:read)
    url ||= string_or_io.respond_to?(:path) ? string_or_io.path : nil
    return read_io(string_or_io, url, encoding, options.to_i)
  end
  # read_memory pukes on empty docs
  return new if string_or_io.nil? or string_or_io.empty?
  read_memory(string_or_io, url, encoding, options.to_i)
end

def serialize options = {}, &block


end
config.format.as_xml
node.serialize(:encoding => 'UTF-8') do |config|

or

node.serialize(:encoding => 'UTF-8', :save_with => FORMAT | AS_XML)

These two statements are equivalent:

block. See SaveOptions.
Serialize Node using +options+. Save options can also be set using a
### 
def serialize options = {}, &block
  options[:save_with] ||= XML::Node::SaveOptions::FORMAT |
      XML::Node::SaveOptions::AS_HTML |
      XML::Node::SaveOptions::NO_DECLARATION |
      XML::Node::SaveOptions::NO_EMPTY_TAGS
  super
end