| http://www.w3.org/ns/prov#value | - Readers can add comments and links and participate in discussions as they would on other social networking sites, such as Facebook, and authors can provide their own supplementary commentary to readers on the app.Subtext is compatible with ebooks from any retailer, but is integrated closely with Google Books; readers can open Google Books from within the Subtext app, and Subtext automatically sync
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