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- W81180329 abstract "Design applications typically require radically varied views of shared design data, ranging from highly compact hierarchical design artifacts to flat and unfolded structures. Because current OODB view technology is not capable of providing this requisite variety of representations, we address this problem by providing special-purpose support for manipulating and querying hierarchical structures. Our object model lays the foundation for the implementation of meta-classes required to support hierarchical set operations. For example, the algebra defined over the data model allows the implicit unfolding of hierarchical sets, providing users with a (virtual) flattened and unfolded view of shared data without the penalty of having to maintain replicated data. It thus forms the basis for powerful extensions to the view capabilities of the OODB view system MultiView. Our query operators can be used to derive unmaterialized, unfolded, and updatable views from folded hierarchical sets. These views are updatable using two types of update operations, namely, in-context and out-of-context updates. For this purpose, we present an algorithm to optimally perform in-context updates on an unfolded view via selective unfolding. In order to evaluate the advantages and limitations of interoperating through such complex hierarchical and flattened views of design data, we also present empirical performance results comparing queries on implicitly and explicitly unfolded hierarchical sets." @default.
- W81180329 created "2016-06-24" @default.
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- W81180329 date "2000-01-01" @default.
- W81180329 modified "2023-09-27" @default.
- W81180329 title "An Object Model and Algebra for the Implicit Unfolding of Hierarchical Structures0" @default.
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