Dynamic appearance is the art and mystery of creating two different looks from the same document. At a certain level, it's not hard: just switch style-sheets. But when you get into more page-specific properties, you need to use something more complicated, such as (say) Javascript. Sounds simple, but the security provisions in Javascript make it difficult. This article describes the approach taken by Canada's Department of National Defense, the authors of which have been involved with SCORM since before there was SCORM. Docbook, an XML content format, has been designed for this purpose, but is in the words of the author, "fiercely complex" and was dropped by EML. This comment sparked a response from Pierre Gorissen, who argues that it wasn't that complex and that what EML dropped wasn't Docbook, exactly. And the saga continues.
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