Data models use a limited number of basic structures to represent data such as collections, attri... more Data models use a limited number of basic structures to represent data such as collections, attribute-value pairs, and scalars. They differ, however, in how structures are composed and whether they permit the specification of schema, permit more than one schema, or require schema. Support for transforming between heteroge- neous representation schemes remains a significant challenge. To this aim, we extend
International Workshop on the Web and Databases, 2004
In our research on superimposed information management, we have developed applications where info... more In our research on superimposed information management, we have developed applications where information elements in the superimposed layer serve to annotate, comment, restructure, and combine selections from one or more existing documents in the base layer. Base documents tend to be unstructured or semi-structured (HTML pages, Excel spreadsheets, and so on) with marks delimiting selections. Selections in the base layer
Object-Oriented and Entity-Relationship Modelling/International Conference on Conceptual Modeling / the Entity Relationship Approach, 2002
Considerable research exists on providing structured access to unstructured information sources, ... more Considerable research exists on providing structured access to unstructured information sources, primarily for search and query. Lit- tle attention has been placed on (1) keeping the by-products of the pro- cess (e.g., connections between structured and unstructured data are typically forgotten and context is lost), (2) developing a rich, conceptual structure for this new layer of information (e.g., the structured
International Conference on Data Engineering, 1989
An approach known as constraint analysis is presented for specifying updatable perspectives of cl... more An approach known as constraint analysis is presented for specifying updatable perspectives of class objects in an object-oriented data schema. Perspectives provide a way of defining the scope of a user's view of a schema. Operations on class objects are then defined in terms of specific perspectives based on the semantics associated with the schema. Schema semantics are represented as
International Workshop on Distributed Object Management/Workshop on Object-Oriented Database Systems, 1988
Constraint analysis is a design tool for object-oriented database environments that makes use of ... more Constraint analysis is a design tool for object-oriented database environments that makes use of knowledge about constraints to support the design of user views and the specification of propagation actions. The constraint analysis process is supported by the formal, uniform representation of schema constraints. The formal representation supports the ability to analyze and explain constraints; the uniform representation allows both
ACM International Conference Proceeding Series, 2004
A person working with diverse information sources---with possibly different formats and informati... more A person working with diverse information sources---with possibly different formats and information models---may recognize and wish to express conceptual structures that are not explicitly present in those sources. Rather than replicate the portions of interest and recast them into a single, combined data source, we leave defines a collection of architectural abstractions, placed between superimposed and base applications, to demarcate
There are a variety of ways to represent information and each representation scheme typically has... more There are a variety of ways to represent information and each representation scheme typically has associated tools to manipulate information so long as it is represented properly. We are particularly interested in representations for superimposed information, where supplementary information can be used to highlight, annotate, elaborate, and interconnect underlying information. The Resource Description Framework (RDF) and the Topic Map model
Object-Oriented and Entity-Relationship Modelling/International Conference on Conceptual Modeling / the Entity Relationship Approach, 1999
The ubiquitous World Wide Web presents a simple interface for a vast array of heterogeneous infor... more 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.
This paper presents Structured Maps, an additionalmodeling construct superimposed over availablei... more This paper presents Structured Maps, an additionalmodeling construct superimposed over availableinformation sources, that provides structured and managedaccess to data. Structured Maps are based on TopicNavigation Maps, defined by the SGML community toprovide multi-document indices and glossaries.
International Workshop on the Web and Databases, 1999
IntroductionIt has existed for several millennia, in the form of commentaries on religious books,... more IntroductionIt has existed for several millennia, in the form of commentaries on religious books, law andliterature. We see it today in concordances, citation indexes and genome maps. You probablyhave created some of it, as a bookmark file in your web browser. The "it" we refer to issuperimposed information: data "placed over" existing information sources to help organize,access, connect and reuse
In the trade-offs between security and performance, it seems that security is always the loser. I... more In the trade-offs between security and performance, it seems that security is always the loser. If we allow for adaptive security, we can at least ensure that security and performance are treated somewhat equally. Using adaptive security, we can allow a system to exist in a less secure, more performant state until it comes under attack. We then adapt the
Writing relational database queries over current provenance databases can be complex and error-pr... more Writing relational database queries over current provenance databases can be complex and error-prone because ap- plication data is typically mixed with provenance data, because queries may require recursion, and because the form in which provenance is maintained requires procedural parsing not easily framed in query syntax. As a result, it is of- ten difficult to write queries that select (rows
Object-Oriented and Entity-Relationship Modelling/International Conference on Conceptual Modeling / the Entity Relationship Approach, 2005
... Matthias Jarke Christian S. Jensen Manfred Jeusfeld Hannu Kangassalo Kamalakar Karlapalem Rol... more ... Matthias Jarke Christian S. Jensen Manfred Jeusfeld Hannu Kangassalo Kamalakar Karlapalem Roland Kaschek Vijay Khatri Dongwon Lee ... Viet Christopher Popfinger Maurizio Vincini Christoph Quix Johanna Vompras Erhard Rahm Changjie Wang Ana Paula Rocha Stella ...
Journal of The American Society for Information Science and Technology, 2002
Digital libraries allow information access to be inte- grated into work processes rather than sep... more Digital libraries allow information access to be inte- grated into work processes rather than separated from them, but also have the potential to overwhelm users with excessive or irrelevant information, impairing their performance rather than improving it. With the opportu- nity to create new models of what a library is and how it can be used comes the challenge of
Decision makers need high-level information on a wide variety of topics. In particular they are n... more Decision makers need high-level information on a wide variety of topics. In particular they are not constrained by the current contents of available information sources. They often ask for data that is not present. On the other hand there is often a large body of relevant, detailed data that could be usefully summarized or abstracted for the decision maker. We
Proceedings of the 2006 national conference on Digital government research - dg.o '06, 2006
Page 1. Accelerated Indexing in a Domain-Specific Digital Library 1Lois Delcambre, 1Susan Price, ... more Page 1. Accelerated Indexing in a Domain-Specific Digital Library 1Lois Delcambre, 1Susan Price, 2Marianne Lykke Nielsen, 3Timothy Tolle, 4Vibeke Luk, 5Mathew Weaver 1Computer Science Department Portland State University {prices, lmd}@cs.pdx.edu ...
Data models use a limited number of basic structures to represent data such as collections, attri... more Data models use a limited number of basic structures to represent data such as collections, attribute-value pairs, and scalars. They differ, however, in how structures are composed and whether they permit the specification of schema, permit more than one schema, or require schema. Support for transforming between heteroge- neous representation schemes remains a significant challenge. To this aim, we extend
International Workshop on the Web and Databases, 2004
In our research on superimposed information management, we have developed applications where info... more In our research on superimposed information management, we have developed applications where information elements in the superimposed layer serve to annotate, comment, restructure, and combine selections from one or more existing documents in the base layer. Base documents tend to be unstructured or semi-structured (HTML pages, Excel spreadsheets, and so on) with marks delimiting selections. Selections in the base layer
Object-Oriented and Entity-Relationship Modelling/International Conference on Conceptual Modeling / the Entity Relationship Approach, 2002
Considerable research exists on providing structured access to unstructured information sources, ... more Considerable research exists on providing structured access to unstructured information sources, primarily for search and query. Lit- tle attention has been placed on (1) keeping the by-products of the pro- cess (e.g., connections between structured and unstructured data are typically forgotten and context is lost), (2) developing a rich, conceptual structure for this new layer of information (e.g., the structured
International Conference on Data Engineering, 1989
An approach known as constraint analysis is presented for specifying updatable perspectives of cl... more An approach known as constraint analysis is presented for specifying updatable perspectives of class objects in an object-oriented data schema. Perspectives provide a way of defining the scope of a user's view of a schema. Operations on class objects are then defined in terms of specific perspectives based on the semantics associated with the schema. Schema semantics are represented as
International Workshop on Distributed Object Management/Workshop on Object-Oriented Database Systems, 1988
Constraint analysis is a design tool for object-oriented database environments that makes use of ... more Constraint analysis is a design tool for object-oriented database environments that makes use of knowledge about constraints to support the design of user views and the specification of propagation actions. The constraint analysis process is supported by the formal, uniform representation of schema constraints. The formal representation supports the ability to analyze and explain constraints; the uniform representation allows both
ACM International Conference Proceeding Series, 2004
A person working with diverse information sources---with possibly different formats and informati... more A person working with diverse information sources---with possibly different formats and information models---may recognize and wish to express conceptual structures that are not explicitly present in those sources. Rather than replicate the portions of interest and recast them into a single, combined data source, we leave defines a collection of architectural abstractions, placed between superimposed and base applications, to demarcate
There are a variety of ways to represent information and each representation scheme typically has... more There are a variety of ways to represent information and each representation scheme typically has associated tools to manipulate information so long as it is represented properly. We are particularly interested in representations for superimposed information, where supplementary information can be used to highlight, annotate, elaborate, and interconnect underlying information. The Resource Description Framework (RDF) and the Topic Map model
Object-Oriented and Entity-Relationship Modelling/International Conference on Conceptual Modeling / the Entity Relationship Approach, 1999
The ubiquitous World Wide Web presents a simple interface for a vast array of heterogeneous infor... more 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.
This paper presents Structured Maps, an additionalmodeling construct superimposed over availablei... more This paper presents Structured Maps, an additionalmodeling construct superimposed over availableinformation sources, that provides structured and managedaccess to data. Structured Maps are based on TopicNavigation Maps, defined by the SGML community toprovide multi-document indices and glossaries.
International Workshop on the Web and Databases, 1999
IntroductionIt has existed for several millennia, in the form of commentaries on religious books,... more IntroductionIt has existed for several millennia, in the form of commentaries on religious books, law andliterature. We see it today in concordances, citation indexes and genome maps. You probablyhave created some of it, as a bookmark file in your web browser. The "it" we refer to issuperimposed information: data "placed over" existing information sources to help organize,access, connect and reuse
In the trade-offs between security and performance, it seems that security is always the loser. I... more In the trade-offs between security and performance, it seems that security is always the loser. If we allow for adaptive security, we can at least ensure that security and performance are treated somewhat equally. Using adaptive security, we can allow a system to exist in a less secure, more performant state until it comes under attack. We then adapt the
Writing relational database queries over current provenance databases can be complex and error-pr... more Writing relational database queries over current provenance databases can be complex and error-prone because ap- plication data is typically mixed with provenance data, because queries may require recursion, and because the form in which provenance is maintained requires procedural parsing not easily framed in query syntax. As a result, it is of- ten difficult to write queries that select (rows
Object-Oriented and Entity-Relationship Modelling/International Conference on Conceptual Modeling / the Entity Relationship Approach, 2005
... Matthias Jarke Christian S. Jensen Manfred Jeusfeld Hannu Kangassalo Kamalakar Karlapalem Rol... more ... Matthias Jarke Christian S. Jensen Manfred Jeusfeld Hannu Kangassalo Kamalakar Karlapalem Roland Kaschek Vijay Khatri Dongwon Lee ... Viet Christopher Popfinger Maurizio Vincini Christoph Quix Johanna Vompras Erhard Rahm Changjie Wang Ana Paula Rocha Stella ...
Journal of The American Society for Information Science and Technology, 2002
Digital libraries allow information access to be inte- grated into work processes rather than sep... more Digital libraries allow information access to be inte- grated into work processes rather than separated from them, but also have the potential to overwhelm users with excessive or irrelevant information, impairing their performance rather than improving it. With the opportu- nity to create new models of what a library is and how it can be used comes the challenge of
Decision makers need high-level information on a wide variety of topics. In particular they are n... more Decision makers need high-level information on a wide variety of topics. In particular they are not constrained by the current contents of available information sources. They often ask for data that is not present. On the other hand there is often a large body of relevant, detailed data that could be usefully summarized or abstracted for the decision maker. We
Proceedings of the 2006 national conference on Digital government research - dg.o '06, 2006
Page 1. Accelerated Indexing in a Domain-Specific Digital Library 1Lois Delcambre, 1Susan Price, ... more Page 1. Accelerated Indexing in a Domain-Specific Digital Library 1Lois Delcambre, 1Susan Price, 2Marianne Lykke Nielsen, 3Timothy Tolle, 4Vibeke Luk, 5Mathew Weaver 1Computer Science Department Portland State University {prices, lmd}@cs.pdx.edu ...
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