`Design of service oriented-architecture for Federated Systems.`

Running Head : SOA IN FEDERATED SYSTEMS

SOA in Federated Systems

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Summary

In an article Design of a Service-Oriented Architecture for a Federated Systems , Daniel Calegari , Marcos Viera , and Regina Motz (2005 ) proposed a Service-Oriented Architecture to be applied in Federal Systems Federated Systems are composed of computer systems or databases that are independent , cooperative , heterogeneous , and autonomous used in data sharing . Service-Oriented Architecture , on the other hand , has functions which provide independent services and transparent communication . The application of this type of architecture will provide practical

services for Federated Systems such as allowing data sharing of many users access control and rights to data , integration and querying processes with high level of automation , determining the foundations if the federation 's management framework , and validating both the framework and the architecture (Calegari et al , 2005 ,

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A Federated System has three properties (1 ) distribution , which allows for data distribution logically and physically (2 ) autonomy , which allows independent execution and user access to data and (3 heterogeneity , which can provides heterogeneity on sources ' execution semantics , structure , and query language . The proposed design for a Federated System by Calegari et al (2005 ) is consist of five-level architecture including the properties mentioned . Every source will have a local schema (and a query language each ) that will be converted to a schema with canonical language using the transforming processor to produce a component schema . The access control of the federation to the information id is determined by each source through a filtering processor that will be generating an export schema to each source Through a constructing processor , a federated schema will be produced In for the users to access the data , the filtering processor will execute another access control that will generate an external schema for the user 's access (Calegari et al , 2005 ,

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The properties of a Service-Oriented Architecture allow for the heterogeneity and reusability of a framework and if this will be applied in Federated Systems , users ' access to data will be more convenient . In to validate the performance of the proposed architecture , Calegari et al (2005 ) has developed a prototype equipped with architecture structure for the federation such as federation controller , integrator query decomposer , invoker , and rights manager (p . 169 and also structure for the source such as service controller , query filter schema filter , data source connector , and rights manager (p . 170 . Each of the sources will be providing a schema , permissions for pro exportation , and CRUD operations in for the federation to offer administrative and federation functionalities . One of the significant features of the proposed architecture is the automation of the selected processes . The achievability of the functional system based from the proposed architecture has been demonstrated in the prototype (Calegari et al , 2005 ,

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The proposed design using a five-level Service-Oriented Structure maintains the properties of sources in Federated Systems and also supports user pros , access rights for data , and transparency Databases are incorporated , abstract applications are used applied for the...