One of the main question is, how to adress the elements in the instance you want to check. Since November 1999, the answer can be a W3C recommendation - the XPATH standard.
These recommondation allows the authors of the dci to use a query language, which is tool independed and well described.
To use these query statements, some time is necessary, to understand the syntax.
A good tool for developing the xpath-statements is the visual pattern builder from Micrsoft. It is freeware, which is (including source) accessible on the Microsoft web site.
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