| 摘要 |
A business intelligence (BI) system includes the ability to extend its functionality outside of the project life cycle by means of specific content. Complex multidimensional queries are interpreted as trees of atomic sub-expressions that are combined in a parse-tree-like structure to form the overall query. Each sub tree is valid in isolation when provided with the proper context. Any sub tree can be an expression template, stored as application content, which at generation time uses simple text substitution with instance specific parameters to produce multidimensional expression syntax. The system includes a sophisticated type system and semantic layer that hides the user from the complexities inherent in working with OLAP databases. A business intelligence expert can provide type and semantic cues for each expression template, held as content.
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