The interface definitions of accessibility infrastructure.

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* What's changed for atk 1.18.0?
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Fixes #408527, #398038, #367627.

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* Where can I get it?
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Source code:
http://ftp.gnome.org/pub/gnome/sources/atk/1.18/atk-1.18.0.tar.bz2
http://ftp.gnome.org/pub/gnome/sources/atk/1.18/atk-1.18.0.tar.gz

Enjoy,
Li