Formalization of Federated Schema Architectural Style Variability

Formalization of Architectural Refactorings

Style-Based Architectural Reconfigurations

We introduce Architectural Design Rewriting (ADR), an approach to deal with the design of reconfigurable software architectures. The key features we promote are: (i) rule-based approach (over graphs); (ii) hierarchical design; (iii) algebraic presentation; and (iv) inductivelydefined reconfigurations. Architectures are suitably modeled by graphs whose edges and nodes respectively represent comp...

Schema Evolution in Federated Information Systems

Mediators – used in federated information systems – provide a homogeneous read-only access to a set of autonomous information sources. To achieve semantic integration of the heterogeneous data, correspondences between the autonomous schemas are specified manually by experts. Considering the continuous evolution of those typically long-living information systems, schema evolution is an important...

Schema Transformation Processors for Federated Objectbases

In contrast to three schema levels in centralized objectbases, a reference architecture for federated objectbase systems proposes five levels of schemata. This paper investigates the fundamental mechanisms to be provided by an object model to realize the processors transforming between these levels, namely schema ezlension, s&emu filtering, and schema composition. It is shown, how composition a...

Describing the PGM Architectural Style †