Could you inform me about pluginpackage.manifest.xml?

Hello,
Could you inform me about pluginpackage.manifest.xml?
To make Plugin for only Trados Studio2014, I'm going to set maximumversion in a manifest file, but it doesn't work.
When I describe< RequiredProduct name="SDLTradosStudio" maximumversion="11.9" /> then compile, an error occurs.
How should it be described?
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