Multi-Granular Schemas for Data Integration

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Provided by: RWTH Aachen University
Topic: Data Management
Format: PDF
Data can contain information at different levels of granularities but this metadata is generally left implicit in the data model. If users want to take advantage of different levels of granularity when integrating data, they need to first extend database schemas to include granularity information. In this paper, they provide a multi-granular domain schema that is used in the formalization of database schemas so that each attribute is assigned a certain granularity; and explore the issues when integrating data at different granularities and suggest possible global schemas and instances.
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