Smalltalk-80: the language and its implementation
Smalltalk-80: the language and its implementation
The Gem–Stone data management system
Object-oriented concepts, databases, and applications
Efficient management of transitive relationships in large data and knowledge bases
SIGMOD '89 Proceedings of the 1989 ACM SIGMOD international conference on Management of data
From structured documents to novel query facilities
SIGMOD '94 Proceedings of the 1994 ACM SIGMOD international conference on Management of data
A query language and optimization techniques for unstructured data
SIGMOD '96 Proceedings of the 1996 ACM SIGMOD international conference on Management of data
PODS '97 Proceedings of the sixteenth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
Inferring structure in semistructured data
ACM SIGMOD Record
Extracting schema from semistructured data
SIGMOD '98 Proceedings of the 1998 ACM SIGMOD international conference on Management of data
A Formal Definition of the Chimera Object-Oriented Data Model
Journal of Intelligent Information Systems
XML Complete
IEEE Transactions on Knowledge and Data Engineering
Object Exchange Across Heterogeneous Information Sources
ICDE '95 Proceedings of the Eleventh International Conference on Data Engineering
Correspondence and Translation for Heterogeneous Data
ICDT '97 Proceedings of the 6th International Conference on Database Theory
Queries and Computation on the Web
ICDT '97 Proceedings of the 6th International Conference on Database Theory
ICDT '97 Proceedings of the 6th International Conference on Database Theory
Adding Structure to Unstructured Data
ICDT '97 Proceedings of the 6th International Conference on Database Theory
Modeling and Querying Semi-structured Data
SCIE '97 International Summer School on Information Extraction: A Multidisciplinary Approach to an Emerging Information Technology
DataGuides: Enabling Query Formulation and Optimization in Semistructured Databases
VLDB '97 Proceedings of the 23rd International Conference on Very Large Data Bases
Incremental Class Dictionary Learning and Optimization
ECOOP '91 Proceedings of the European Conference on Object-Oriented Programming
Computing simulations on finite and infinite graphs
FOCS '95 Proceedings of the 36th Annual Symposium on Foundations of Computer Science
The BACK System Revisited
An algebraic definition of simulation between programs
IJCAI'71 Proceedings of the 2nd international joint conference on Artificial intelligence
Matching an XML Document against a Set of DTDs
ISMIS '02 Proceedings of the 13th International Symposium on Foundations of Intelligent Systems
Exception Handling in Object-Oriented Databases
Advances in Exception Handling Techniques (the book grow out of a ECOOP 2000 workshop)
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Several advanced applications, such as those dealing with the Web, need to handle data whose structure is not known a-priori. Such requirement severely limits the applicability of traditional database techniques, that are based on the fact that the structure of data (e.g. the database schema) is known before data are entered into the database. Moreover, in traditional database systems, whenever a data item (e.g. a tuple, an object, and so on) is entered, the application specifies the collection (e.g. relation, class, and so on) the data item belongs to. Collections are the basis for handling queries and indexing and therefore a proper classification of data items in collections is crucial. In this paper, we address this issue in the context of an extended object-oriented data model. We propose an approach to classify objects, created without specifying the class they belong to, in the most appropriate class of the schema, that is, the class closest to the object state. In particular, we introduce the notion of weak membership of an object in a class, and define two measures, the conformity and the heterogeneity degrees, exploited by our classification algorithm to identify the most appropriate class in which an object can be classified, among the ones of which it is a weak member.