Dealing with granularity of time in temporal databases
CAiSE '91 Proceedings of the third international conference on Advanced information systems engineering
Automatic deduction of temporal information
ACM Transactions on Database Systems (TODS)
Temporal modules: an approach toward federated temporal databases
SIGMOD '93 Proceedings of the 1993 ACM SIGMOD international conference on Management of data
Logical design for temporal databases with multiple granularities
ACM Transactions on Database Systems (TODS)
Modeling temporal primitives: back to basics
CIKM '97 Proceedings of the sixth international conference on Information and knowledge management
Temporal granularity for unanchored temporal data
Proceedings of the seventh international conference on Information and knowledge management
Time modeling in office information systems
SIGMOD '85 Proceedings of the 1985 ACM SIGMOD international conference on Management of data
The TSQL2 Temporal Query Language
The TSQL2 Temporal Query Language
A general framework for time granularity and its application to temporal reasoning
Annals of Mathematics and Artificial Intelligence
DBMS Support for Nonmetric Measurement Systems
IEEE Transactions on Knowledge and Data Engineering
The Historical Relational Data Model (HRDM) and Algebra Based on Lifespans
Proceedings of the Third International Conference on Data Engineering
Proceedings of the Ninth International Conference on Data Engineering
GCH-OSQL: a temporally-oriented object-oriented query language based on a three-valued logic
TIME '97 Proceedings of the 4th International Workshop on Temporal Representation and Reasoning (TIME '97)
Symbolic Representation of User-Defined Time Granularities
TIME '99 Proceedings of the Sixth International Workshop on Temporal Representation and Reasoning
Temporality in object database management systems
Temporality in object database management systems
IEEE Transactions on Information Technology in Biomedicine
Merging structured text using temporal knowledge
Data & Knowledge Engineering
Deriving Abstract Views of Multi-granularity Temporal Constraint Networks
DEXA '02 Proceedings of the 13th International Conference on Database and Expert Systems Applications
Simple Semantics in Topic Detection and Tracking
Information Retrieval
Event choice datalog: a logic programming language for reasoning in multiple dimensions
PPDP '04 Proceedings of the 6th ACM SIGPLAN international conference on Principles and practice of declarative programming
Temporal document retrieval model for business news archives
Information Processing and Management: an International Journal - Special issue: Cross-language information retrieval
Temporal reasoning for decision support in medicine
Artificial Intelligence in Medicine
Journal of Biomedical Informatics
Topic tracking with time granularity reasoning
ACM Transactions on Asian Language Information Processing (TALIP)
Mining fuzzy periodic association rules
Data & Knowledge Engineering
Controllability in Temporal Conceptual Workflow Schemata
BPM '09 Proceedings of the 7th International Conference on Business Process Management
GeTS: a specification language for geo-temporal notions
KI'06 Proceedings of the 29th annual German conference on Artificial intelligence
Topic detection and tracking with spatio-temporal evidence
ECIR'03 Proceedings of the 25th European conference on IR research
Intelligent visualization and exploration of time-oriented data of multiple patients
Artificial Intelligence in Medicine
Protecting privacy against location-based personal identification
SDM'05 Proceedings of the Second VDLB international conference on Secure Data Management
Visually defining and querying consistent multi-granular clinical temporal abstractions
Artificial Intelligence in Medicine
Conceptual modeling of flexible temporal workflows
ACM Transactions on Autonomous and Adaptive Systems (TAAS)
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Granularity is an integral feature of both anchored (e.g., 25 October 1995, July 1996) and unanchored (e.g., 3 minutes, 6 hours 20 minutes, 5 days) temporal data. In supporting temporal data that is specified in different granularities, numerous approaches have been proposed to deal with the issues of converting temporal data from one granularity to another. The emphasis, however, has only been on granularity conversions with respect to anchored temporal data. In this paper we provide a novel approach to the treatment of granularity in temporal data. A granularity is modeled as a special kind of unanchored temporal primitive that can be used as a unit of time. That is, a granularity is modeled as a unit unanchored temporal primitive. We show how unanchored temporal data is represented, give procedures for converting the data to a given granularity, provide canonical forms for the data, and describe how operations between the data are performed. We also show how anchored temporal data is represented at different granularities and give the semantics of operations on anchored temporal data.