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Adapting Mappings in Frequently Changing Environments (2003)
| Citations: | 2 - 2 self |
BibTeX
@TECHREPORT{Velegrakis03adaptingmappings,
author = {Yannis Velegrakis and Renee J. Miller and Lucian Popa},
title = {Adapting Mappings in Frequently Changing Environments},
institution = {},
year = {2003}
}
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Abstract
To achieve interoperability, modern information systems and e-commerce applications use mappings to translate data from one representation to another. In dynamic environments like the Web, data sources may change not only their data but also their schemas, their semantics, and their query capabilities. Such changes must be reflected in the mappings. Mappings left inconsistent by a schema change have to be detected and updated. As large, complicated schemas become more prevalent, and as data is reused in more and more applications, manually maintaining mappings (even simple mappings like view definitions) is becoming impractical. We present a novel framework and tool for automatically adapting mappings as schemas evolve. Our approach considers not only local changes to a schema, but also changes that may affect and transform many components of a schema. We consider a comprehensive class of mappings for relational and XML schemas with choice types and (nested) constraints. Our algorithm detects mappings affected by a structural or constraint change and generates all the rewritings that are consistent with the semantics of the mapped schemas. Our approach explicitly models mapping choices made by a user and maintains these choices, whenever possible, as the schemas and mappings evolve.
Keyphrases
frequently changing environment mapped schema data source comprehensive class novel framework dynamic environment constraint change simple mapping modern information system query capability schema change e-commerce application choice type schema evolve many component algorithm detects mapping local change view definition
