1. A code for representing encoded data and being capable of being decoded, said code comprising: a first plurality of color blots, said first plurality of color blots comprising a second plurality of color blots and a third plurality of color blots, said second plurality of color blots being arranged so as to indicate a first url, wherein: said first url identifies a first markup language document, said first markup language document being suitable to be parsed and comprising information, said information being suitable for use in determining how said third plurality of color blots is decoded.