6. .doc – file format Windows MS Word 2000 Mac OS X Since .doc is closed binary-format, there are very few alternatives for word processors that fully support the doc – file format 0101011010101010001010 1010101110101010001011 1010101110101010110101 1110101010101010101010
7. .docx – file format (Office Open XML) Windows MS Word 2007 Mac OS X Hopefully in the future there will be loads of free programs that support this new open and easy access file format <xml> <heading1>title</heading1> . . </xml> Now the format is open and it's much easier to access
8. SGML vs. XML SGML: Standard Generalized Markup Language XML HTML (.html) XHTML (.xhtml) MathML (.mml) OOXML (.docx)
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30. DTD Linking Defines the structure, tag names and order for all xhtml - documents W3C has created XML-language "XHTML" by defining it's rules in DTD.
34. Invalid XHTML in Browser? May work... or not. Browser tries to detect the errors and tries to understand them. If it works with one browser, are you certain that it works with all other browsers? And with all the versions with the browsers? What about browsers in handheld devices? And it might work now, but what about future ? How will Firefox 5.0 handle incorrect web pages?