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If you want to extract text the easiest way to do it is to convert to txt.
If you want to do it using calibre APIs then you will need to spend the time to familiarize yourself with them. The setting up a calibre development environment section in the user manual tells you how to get started.
You basically need to run the input format plugin on the file, then you can use calibre.ebooks.oeb.polish.container.Container object to access the contents of the result of running the input format plugin
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