O2, an Object-Oriented Data Model

TL;DR: This work introduces aspects, a new mechanism designecf to meet, these modelling requirements within the framework of a strongly-typed 00DBS, and extends an existing object with new state and new behavior while maintaining the same object identity.

TL;DR: An algebra that synthesizes relational query concepts with object-oriented databases is defined and support for object identity leads to new definitions for equality of results and operators that can manipulate the identities of objects.

TL;DR: It is argued that covariance and contravariance appropriately characterize two distinct and independent mechanisms that each have their place in object-oriented systems and can (and should) be integrated in a type-safe manner inobject-oriented languages.

TL;DR: This paper studies the RDF model from a database perspective, focuses on query languages, analyze current RDF trends, and proposes the incorporation to RDF query languages of primitives which are not present today, based on the experience and techniques of graph database research.

TL;DR: A data model is proposed that generalizes the relational, hierarchical, and network models and is a directed graph, where leaves represent data and internal nodes represent connections between the data.

TL;DR: Gal as mentioned in this paper is a strongly typed, interactive programming language designed specifically to support semantic data model features (classification, aggregation, and specialization), as well as the abstraction mechanisms of modern programming languages (types, abstract types, and modularization).