Zouhaier Brahmia

Schema versioning in τXSchema-based multitemporal XML repositories

τXSchema [7] is a framework (a language and a suite of tools) for the creation and validation of time-varying XML documents. A τXSchema schema is composed of a conventional XML Schema document annotated with physical and logical annotations. All components of a τXSchema schema (i.e., conventional schema, logical annotations, and physical annotations) can change over time to reflect changes in user requirements or in reference world of the database. Since many applications need to keep track of both data and schema evolution, schema versioning has been long advocated to be the best solution to do this. In this paper, we deal with schema versioning in the τXSchema framework. More precisely, we propose a set of schema change primitives for the maintenance of logical and physical annotations and define their operational semantics.

Schema Versioning in Multi-temporal XML Databases

Schema evolution keeps only the current data and the schema version after applying schema changes. On the contrary, schema versioning creates new schema versions and preserves old schema versions and their corresponding data. Much research work has recently focused on the problem of schema evolution in XML databases, but less attention has been devoted to schema versioning in such databases. In this paper, we present an approach for schema versioning in multitemporal XML databases. This approach is based on the XML Schema language for describing XML schema, and is database consistency-preserving.

Gestion des données temporelles dans un environnement multiversion de schémas

Temporal database management, where modification operations must be achieved with a non-destructive manner, is complex. It becomes more and more complex in an environment where the DBMS must keep track of component schema evolutions of the information system, since the data to be manipulated could be defined under different schema versions. However, evolution of these schemas is unavoidable and schema versioning is indispensable if one wants to guarantee a complete history of data. In order to better control this management. We first propose a model which allows representing and managing temporal data, in an environment supporting full schema versioning. We then develop a fine strategy for an effective management and a smooth evolution of these data.

Versioning of Conventional Schema in the tXSchema Framework

Schema versioning is an indispensable feature for applications using temporal databases and requiring an entire history of data and schema. tXSchema [7] is an infrastructure for constructing and validating temporal XML documents, but any explicit support for XML schema versioning is offered. A ôXSchema schema is composed of a conventional XML Schema document annotated with physical and logical annotations. All components of a ôXSchema schema can change over time to reflect changes in user requirements or in reference world of the database. In a previous work [10], we deal with versioning of logical and physical annotations. In this work, we study versioning of ôXSchema conventional schema: we propose a complete set of low-level primitives for changing such a schema and define their operational semantics.

\(\uptau \)OWL: A Systematic Approach to Temporal Versioning of Semantic Web Ontologies

The W3C OWL 2 recommendation is an ontology language for the Semantic Web. It allows defining both schema (i.e., entities, axioms, and expressions) and instances (i.e., individuals) of ontologies. However, OWL 2 lacks explicit support for time-varying schema or for time-varying instances. Hence, knowledge engineers or maintainers of semantics-based Web resources have to use ad hoc techniques to specify OWL 2 time-varying ontologies. In this paper, for a disciplined and systematic approach to the temporal management of Semantic Web ontologies, we propose the adoption of a framework called temporal OWL 2 (

tauXUF: A Temporal Extension of the XQuery Update Facility Language for the tauXSchema Framework

\uptau

A Systematic Approach to Efficiently Managing the Effects of Retroactive Updates of Time-varying Data in Multiversion XML Databases

τOWL), which is inspired by the