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Building the Unstructured Data Warehouse: Architecture, Analysis, and Design by Krish Krishnan, W. H. Inmon

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In order to start to address the problems of information in the medical/healthcare environment, it is decided to attack unstructured textual information. The hospital administrators have heard that Textual ETL can be done quickly and easily, unlike other forms of ETL and integrated processing.

The first thing the analysts and designers do is select a set of taxonomies. The taxonomies that are selected relate to the diseases, procedures, and medications that are commonly used in the hospital. Then the taxonomies are “weeded out”. The weeding out process entails the removal of non useful words and phrases in the taxonomies. The taxonomies are weeded because the overhead of leaving non useful words in the taxonomy is great.

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