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TACS
1991
Springer
13 years 11 months ago
An Extension of System F with Subtyping
System F is a well-known typed λ-calculus with polymorphic types, which provides a basis for polymorphic programming languages. We study an extension of F, called F<: (pronoun...
Luca Cardelli, Simone Martini, John C. Mitchell, A...
SIGSOFT
2004
ACM
14 years 8 months ago
System architecture: the context for scenario-based model synthesis
Constructing rigorous models for analysing the behaviour of concurrent and distributed systems is a complex task. Our aim is to facilitate model construction. Scenarios provide si...
Jeff Kramer, Jeff Magee, Robert Chatley, Sebasti&a...
VLDB
2005
ACM
162views Database» more  VLDB 2005»
14 years 1 months ago
XQuery Implementation in a Relational Database System
Many enterprise applications prefer to store XML data as a rich data type, i.e. a sequence of bytes, in a relational database system to avoid the complexity of decomposing the dat...
Shankar Pal, Istvan Cseri, Oliver Seeliger, Michae...
GIS
2000
ACM
13 years 7 months ago
Modeling part-whole relationships for spatial data
Spatialapplications must managepartwhole (PW) relationships between spatial objects, for example, the division of an administrative region into zones based on land use. Support fo...
Rosanne Price, Nectaria Tryfona, Christian S. Jens...
ICDE
1994
IEEE
103views Database» more  ICDE 1994»
13 years 11 months ago
A Multi-Set Extended Relational Algebra - A Formal Approach to a Practical Issue
The relational data model is based on sets of tuples, i.e. it does not allow duplicate tuples in a relation. Many database languages and systems do require multi-set place, the hi...
Paul W. P. J. Grefen, Rolf A. de By