Overhead (engineering)

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In engineering, some methods or components make special demands on the system. The extra design features necessary to accommodate these demands are called overhead. For instance, in electrical engineering, a particular integrated circuit might draw large current, requiring a robust power delivery circuit and a heat-dissipation mechanism. In XML the date 2011-07-12 07:18:47.0000+0000 can be written as follows with an overhead of 180 characters, while adding the semantic context that it is a CHANGEDATE with index 1.

              <DATETIME qualifier="CHANGEDATE" index="1">