Allowing mixed content (text and inline tags) to be direct children of structural elements such as section creates usability problems during authoring and adds complexity to transformations. Mixed content in these contexts is not appropriate for authoring. However, this shortcoming does not appear to be the result of an oversight on the part of the DITA architects. Instead, it appears to be an engineering tradeoff that was made facilitate specialization. Allowing mixed content to appear adds a great deal of flexibility to the information architect's toolbox when specializing.