The Open Text Mining Interface (OTMI) is a proposed method for making available the text of journal articles for indexing and analysis, while preserving any subscription model that funds the journals. This approach, presented in a Web 2.0 session at the Bio-IT World conference earlier this week, uses an Atom XML version of each article, with OTMI namespaced extensions, to provide all the sentences of the article in alphabetical order. Some extra information such as word frequency is also presented, but this could presumably be derived from the sentence text anyway.
All the articles in the 2020 Computing issue of Nature have OTMI files linked using <link rel="OTMI" type="application/atom+xml" href=""/> - here's an example file.