Extending the relational algebra to support transaction time
SIGMOD '87 Proceedings of the 1987 ACM SIGMOD international conference on Management of data
Bibliography on temporal databases
ACM SIGMOD Record
An update of the temporal database bibliography
ACM SIGMOD Record
Managing versions of web documents in a transaction-time web server
Proceedings of the 13th international conference on World Wide Web
Journey to the past: proposal of a framework for past web browser
Proceedings of the seventeenth conference on Hypertext and hypermedia
Modeling temporal dimensions of semistructured data
Journal of Intelligent Information Systems
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Transaction time is the time of a database transaction, i.e., an insertion, update, or deletion. A transaction-time database stores the transaction-time history of a database and supports transaction timeslice queries that retrieve past database states. This paper introduces transaction time to the World-wide Web. In a web context, transaction time is the modification time of a resource such as an XML document. A transaction-time web server archives resource versions and supports transaction timeslice. Unlike a database server, a web server is typically uninvolved in the update of a resource, instead it is only active when a resource is requested. This paper describes a lazy update protocol that enables a web server to manage resource versions during resource reads. An important benefit of our approach is that transaction-time can be supported by a transparent, minimal web server extension; no changes to legacy resources, HTTP, XML, or HTML are required. Furthermore, a web server can seamlessly become a transaction- time sever at any time without affecting or modifying the resources it services or other web servers.