Hello,

The following patch simplifies syntax for attributes.

From the user POV, it removes necessity to quote or escape characters.
For example, these are now valid:

  #+attr_latex: :font \footnotesize :align |l|c|c|
  #+attr_foo: :prop var="value" :another-prop nil

From the developer POV, each non-nil value is now read as a string by
`org-export-read-attribute'.  So:

  #+attr_something: :width 70

will be read as:

  '(:width "70")

If there's no major problem with it, I'll apply it before Monday.
Though, I think ox-odt needs double-checking.


Regards,

-- 
Nicolas Goaziou