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This paper examines some of the issues that arise in the process of XML publishing of mixed-storage proprietary data. It is argued that such data will reside typically in RDBMS's and/or LDAP, etc, augmented with a set of native XML documents. An additional challenge is to take advantage of redundancy in the storage schema, such as mixed materialized views that are stored for the purpose of enhancing performance. The authors argue that such systems need to take into consideration mappings in both directions between the proprietary schema and the published schema. Thus, reformulating queries on the (published) XML schema into executable queries on the stored data will require the effect of both composition-with-views (as in SilkRoute and XPERANTO) and rewriting-with-views (as in the Information Manifold and Agora).
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