Companion books are typically glossariesfor example, The Oxford Companion to Shakespeare but there are also companions that deal with aspects of their subject in more depth . To produce companions in the past, it was necessary to have enough material for a complete book. These days, however, there is companion content on the Internet that is only a few pages in length. Imagine open content: As articles are increasingly published using computer-based devices, it is possible to imagine that users could invoke companion content directly, i.e., by pointing at the relevant item or place in the article, rather than…
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