The entity-relationship model—toward a unified view of data
ACM Transactions on Database Systems (TODS) - Special issue: papers from the international conference on very large data bases: September 22–24, 1975, Framingham, MA
Superimposed Schematics: Introducing E-R Structure for In-Situ Information Selections
ER '02 Proceedings of the 21st International Conference on Conceptual Modeling
From Web Sites to Web Applications: New Issues for Conceptual Modeling
ER '00 Proceedings of the Workshops on Conceptual Modeling Approaches for E-Business and The World Wide Web and Conceptual Modeling: Conceptual Modeling for E-Business and the Web
Querying the Semantic Web with RQL
Computer Networks: The International Journal of Computer and Telecommunications Networking - Special issue: The Semantic Web: an evolution for a revolution
Intensional associations between data and metadata
Proceedings of the 2007 ACM SIGMOD international conference on Management of data
Use of subimages in fish species identification: a qualitative study
Proceedings of the 11th annual international ACM/IEEE joint conference on Digital libraries
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The ubiquitous World Wide Web presents a simple interface for a vast array of heterogeneous information. We see the Web as one enabler for what we call superimposed information. Superimposed information serves to highlight, annotate, connect and supplement information in a base information space. Superimposed information is already pervasive for the Web, with a variety of models and accompanying capabilities. In this paper, we introduce superimposed information and analyze a range of conceptual models for it using a three-part feature space consisting of information elements, links, and marks. Information elements in the superimposed layer and links among those information elements are analogous to the classical entities and relationships of database models. The novelty is in the marks that reference underlying information elements. Superimposed information can serve as proxies for underlying information elements, can provide new access paths, and can introduce new information as well as new links among existing information elements. We conclude with a discussion of open research questions regarding superimposed information.