# File lib/xsd/charset.rb, line 105
  def Charset.encoding_conv(str, enc_from, enc_to)
    if enc_from == enc_to or enc_from == 'NONE' or enc_to == 'NONE'
      str
    elsif converter = EncodingConvertMap[[enc_from, enc_to]]
      converter.call(str)
    else
      raise CharsetConversionError.new(
        "Converter not found: #{enc_from} -> #{enc_to}")
    end
  end