Learn More
To gain insight into how genomic information is translated into cellular and developmental programs, the Drosophila model organism Encyclopedia of DNA Elements (modENCODE) project is comprehensively mapping transcripts, histone modifications, chromosomal proteins, transcription factors, replication proteins and intermediates, and nucleosome properties(More)
Present relational language capabilities are insufficient to provide interoperability of databases even if they are all relational. In particular, unified multidatabaae view definitions cannot reconcile schematic discrepancies, where data in one database correspond to metadata of another. We claim that following new features are necessary: 1. Higher order(More)
Pegasus, a heterogeneous multidatabase management system that responds to the need for effective access and management of shared data across in a wide range of applications, is described. Pegasus provides facilities for multidatabase applications to access and manipulate multipole autonomous heterogeneous distributed object-oriented relational, and other(More)
Domain mismatch and schema mismatch are two of the important semantic integration problems for interoperating heterogeneous databases. This paper structures the domain mismatch problem, illustrates approaches to its solution, and then extends this to the schema mismatch problem. Structuring of the problem and solution includes notions of conceptual(More)
Although central to the current direction of dependency theory, the assumption of a universal relation is incompatible with some aspects of relational database theory and practice. Furthermore, the universal relation is itself ill defined in some important ways. And, under the universal relation assumption, the decomposition approach to database design(More)