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The reason is that a meta-data tool may not always be used to get the information.
Some examples are:
You may shift to a new meta-data tool or having different departments using
different meta-data tool.
Technical experts may directly query on the database.
You company might be integrated with some other company, leading to a change
in the meta-data tool.
This does not mean that meta-data tool should not be used, and of-course not
all the business rules, which can be enforced by Meta-Data (Semantic layer and
navigation to a certain extent..), we should try have an optimum set of business
rule ingrained within the database/OLAP
itself, to ensure that business get
a consistent and reliable information irrespective of the method of access. |