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Results 1 - 6 of 6

Information integration using logical views

by Jeffrey D. Ullman , 1997
"... A number of ideas concerning information-integration tools can be thought of as constructing answers to queries using views that represent the capabilities of information sources. We review the formal basis of these techniques, which are closely related to containment algorithms for conjunctive quer ..."
Abstract - Cited by 485 (4 self) - Add to MetaCart
queries and/or Datalog programs. Then we compare the approaches taken by AT&T Labs' "Information Manifold" and the Stanford "Tsimmis"; project in these terms.

A Query Language and Optimization Techniques for Unstructured Data

by Peter Buneman, Susan Davidson, Gerd Hillebrand, Dan Suciu , 1996
"... A new kind of data model has recently emerged in which the database is not constrained by a conventional schema. Systems like ACeDB, which has become very popular with biologists, and the recent Tsimmis proposal for data integration organize data in tree-like structures whose components can be used ..."
Abstract - Cited by 407 (35 self) - Add to MetaCart
A new kind of data model has recently emerged in which the database is not constrained by a conventional schema. Systems like ACeDB, which has become very popular with biologists, and the recent Tsimmis proposal for data integration organize data in tree-like structures whose components can be used

Integrating accessing heterogeneous information sources in TSIMMIS.

by Hector Garcia-Molina , Joachim Hammer , Kelly Irelandỹ , Annis Papakonstantinou , Jeffrey Ullman , Jennifer Widom - Proc. AAAI Symp. Information Gathering, , 1995
"... Abstract The goal of the TSIMMIS Project is to develop tools that facilitate the rapid integration of heterogeneous information sources that may include both structured and unstructured data. This paper gives an overview of the project, describing components that extract properties from unstructure ..."
Abstract - Cited by 82 (2 self) - Add to MetaCart
and are discussed briefly at the end of this abstract. For the following description of the TSIMMIS architecture refer to Figure 1. Translators and Common Model where the string "temp-in-Fahrenheit"; is a humanreadable label, the type "int"; indicates an integer value, and "80&quot

Information translation, mediation, and mosaic-based browsing in the TSIMMIS system

by Joachim Hammer, Hector Garcia-Molina, Kelly Ireland, Yannis Papakonstantinou, Jeffrey Ullman, Jennifer Widom - In Proceedings of the ACM SIGMOD International Conference on Management of Data , 1995
"... The tsimmis project [2] provides an architecture and tools for accessing multiple heterogeneous information sources by translating source information into a common self-describing object model, called the Object Exchange Model (OEM) [3]. tsimmis provides integrated access to heterogeneous sources th ..."
Abstract - Cited by 37 (0 self) - Add to MetaCart
The tsimmis project [2] provides an architecture and tools for accessing multiple heterogeneous information sources by translating source information into a common self-describing object model, called the Object Exchange Model (OEM) [3]. tsimmis provides integrated access to heterogeneous sources

Querying Semistructured Heterogeneous Information

by Dallan Quass, Anand Rajaraman, Yehoshua Sagiv, Jeffrey Ullman, Jennifer Widom , 1995
"... . Semistructured data has no absolute schema fixed in advance and its structure may be irregular or incomplete. Such data commonly arises in sources that do not impose a rigid structure (such as the World-Wide Web) and when data is combined from several heterogeneous sources. Data models and query l ..."
Abstract - Cited by 123 (12 self) - Add to MetaCart
languages designed for well structured data are inappropriate in such environments. Starting with a "lightweight"; object model adopted for the TSIMMIS project at Stanford, in this paper we describe a query language and object repository designed specifically for semistructured data. Our language

Extracting Semistructured Information from the Web

by Hammer Garcia-Molina Cho, J. Hammer, H. Garcia-molina, J. Cho, R. Aranha, A. Crespo - In Proceedings of the Workshop on Management of Semistructured Data , 1997
"... We describe a configurable tool for extracting semistructured data from a set of HTML pages and for converting the extracted information into database objects. The input to the extractor is a declarative specification that states where the data of interest is located on the HTML pages, and how th ..."
Abstract - Cited by 2 (0 self) - Add to MetaCart
the data should be "packaged"; into objects. We have implemented the Web extractor using the Python programming language stressing efficiency and ease-of-use. We also describe various ways of improving the functionality of our current prototype. The prototype is installed and running
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