4. The computer readable storage medium of claim 3 , wherein the block elements comprise text, embedded hypertext links and HTML character-formatting elements.
4. The computer readable storage medium of claim 3 , wherein the block elements comprise text, embedded hypertext links and HTML character-formatting elements. 6. The computer readable storage medium of claim 4 , wherein the executable instructions to apply a rules-based, multi-scan markup code reduction normalizer to the first and second documents comprise executable instructions to process the first and second documents character-by-character according to a set of rules.