>    What is an opentype font? and what are the major difference between a
>  truetype font and an opentype font.

An OpenType font is simply a TrueType font with additional tables in it defined
by Microsoft/Adobe.  Some principal ones are GPOS/GSUB, which have to do with
mark placement and glyph substitution, needed for complex text rendering (e.g.
Arabic or Indic).  For more information, see http://www.microsoft.com/opentype.

TrueType is originally an Apple spec, and Apple has different (additional)
tables it uses for mark placement and glyph substitution.  See
http://developer.apple.com/fonts.

Doug

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