Semantic database modeling: survey, applications, and research issues
ACM Computing Surveys (CSUR)
QBD*: A Graphical Query Language with Recursion
IEEE Transactions on Software Engineering
Fundamental graphical primitives for visual query languages
Information Systems
Natural Language Restatement of Queries Expressed in a Graphical Language
ER '92 Proceedings of the 11th International Conference on the Entity-Relationship Approach: Entity-Relationship Approach
An advanced search system for learning objects
Proceedings of the 13th International Conference on Humans and Computers
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We present a general purpose query interface for inexpert users based on the manipulation of icons. The user perceives the reality of interest as structured in classes and attributes while the system internally maintains a schema rich of semantic information. The query language, fully visual, is based on the select and project paradigm that has been proven to be easy to understand. No path specification is required for composing a query. Automatic feedbacks based on natural language generation and cardinality constraints analysis help the user in specifying his/her requests.