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| | Wrappers |
 | | A wrapper encapsulates a single data source to make it usable in a more convenient fashion than the original unwrapped source; this distinguishes wrappers from another kind of glue-ware, mediators, that combine data from different data sources. |
 | | Wrappers are assumed to be "simple", although there is no clear demarcation between what belongs in a "simple" wrapper and a "complex" higher level component. |
 | | Wrappers can be used to present a simplified interface, to encapsulate diverse sources so that they all present a common interface, to add functionality to the data source, or to expose some of the data source's internal interfaces. |
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