Integration of Integrity Constraints in Federated Schemata Based on Tight Constraining

Balsters, Herman; Brock, EO de

doi:10.1007/978-3-540-30468-5_48

Cited by 9 publications

(19 citation statements)

References 16 publications

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“…An overview of data integration concentrating on LAV and GAV can be found in [24]. Papers [1,15] focus on LAV, and [4,5,34] focus on GAV. Our paper focuses on GAV in the context of database federations.…”

Section: Introductionmentioning

confidence: 99%

“…Following the steps of extracting and creating uniform representations of data, the data reconciliation process is concerned with resolving data inconsistencies. GAV as a means to tackle semantic heterogeneity in database federations is described in [4,5,9,34]. Paper [9] treats data integration under global integrity constraints; paper [34] concerns integration of local integrity constraints; Papers [4,5] differ from [9] by also taking local integrity constraints into account, and by adopting exact views ( [2,4,5]) instead of merely sound views ( [9]).…”

Section: Introductionmentioning

confidence: 99%

“…Exact views enable one to maintain the CWA on the global level, when the CWA is satisfied on the local levels. Paper [5] offers an improved algorithm for integrating local constraints on the global level, and also encompasses a far larger class of local constraints.…”

Section: Introductionmentioning

confidence: 99%

“…The results in [4,5] were described in terms of the Unified Modeling Language (UML) [28] and its Object Constraint Language (OCL) [29,35] in the context of database design [8,11,12]. This paper, in contrast, describes a modeling framework for data federations based on the Object-Role Modeling (ORM) approach, also known as fact-oriented modeling.…”

Section: Introductionmentioning

confidence: 99%

“…Both requirements can be satisfied only if there exists an adequate mapping from the federated database states to the component database states. In [4,5] such a mapping was termed a ψ-map, where ψ (psi) is an acronym for preservation of system integrity.…”

Section: Introductionmentioning

confidence: 99%

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Modeling Data Federations in ORM

Balsters

Halpin

On the Move to Meaningful Internet Systems 2007: OTM 2007 Workshops

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Abstract:Two major problems in constructing data federations (for example, data warehouses and database federations) concern achieving and maintaining consistency and a uniform representation of the data on the global level of the federation. The first step in creating uniform representations of data is known as data extraction, whereas data reconciliation is concerned with resolving data inconsistencies. Our approach to constructing a global conceptual schema as the result of integrating a collection of (semantically) heterogeneous component schemas is based on the concept of exact views. We show that a global schema constructed in terms of exact views integrates component schemas in such a way that the global schema is populated by exactly those instances allowed by the local schemas (and in special cases, also the other way around). In this sense, the global schema is equivalent to the set of component schemas from which the global schema is derived. This paper describes a modeling framework for data federations based on the Object-Role Modeling (ORM) approach. In particular, we show that we can represent exact views within ORM, providing the means to resolve in a combined setting data extraction and reconciliation problems on the global level of the federation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modeling Data Federations in ORM

Balsters

Halpin

On the Move to Meaningful Internet Systems 2007: OTM 2007 Workshops

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Semantics of Information Systems Outsourcing

Balsters

Huitema

2005

On the Move to Meaningful Internet Systems 2005: OTM 2005 Workshops

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Semantics of Agent-Based Service Delegation and Alignment

Balsters

Huitema

Szirbik

2005

On the Move to Meaningful Internet Systems 2005: OTM 2005 Workshops

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Abstract. In this paper we will concentrate on the conceptual modeling and semantics of service delegation and alignment in information systems. In delegation, one typically has the situation that a source company wishes to hand over parts of its functionality together with related responsibilities to a supplying party. From the side of the outsourcer the search for a suitable supplier mostly will be a manual process with all the consequences of a long time to market, as well as trial and error before a good fit is obtained between both related parties. This paper addresses an agent-based solution for improving this match-making process in B2B markets. Part of the match-making process will be the alignment of business processes on the side of the outsourcer as well on the side of the supplier. Here we will provide a formal means to ensure that the delegation relationship between both related parties, determined by a ruling service level agreement (SLA), satisfies specific correctness criteria. These correctness criteria are defined in terms of consistency and completeness between the delegated operation and the associated operation offered by the supplier. Our correctness criterion will concern mappings between an existing delegator schema and an existing supplier schema, and will address both semantical and ontological aspects pertaining to delegation and alignment. Agent-based delegation together with formal specifications can prove their value in the process of constructing delegation contracts. Our analysis will be performed within the modeling framework based on the UML/OCL formalism. The concepts we discussed in this paper are illustrated by an example of companies delegating billing services to Billing Service Providers.Keywords. Agents, Recommendor Systems, model/schema matching, data and ontology integration, requirements modeling, operations/services delegation, alignment, UML/OCL IntroductionToday many companies consider delegation of services or functionality outsourcing as a key element in their business strategy [18]. Main reasons are that the cost of internal business processes involves too much resources, that these processes do not keep up with current technologies, and also -in general-do not contribute to the overall mission of the company. By delegating. many organizations will have a better focus on their core operations and can deal with variable operational costs in stead of fixed costs. The choice of a capable outside supplier is critical, however, since such outside suppliers result in serious formal commitments based on contractual agreement. Delegation of services can be divided in two main phases: the pre-contracting phase up to the moment a preferred supplier is found (i.e., till the contract is drawn up), and the execution phase thereafter. The pre-contracting phase is often a more-or-less a vague (and unsatisfactory) process in the B2B market where customers obtain their information about suppliers either from past experiences, verbal transfer, or from industry analysts. Moreover, ...

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Integration of Integrity Constraints in Federated Schemata Based on Tight Constraining

Cited by 9 publications

References 16 publications

Modeling Data Federations in ORM

Modeling Data Federations in ORM

Semantics of Information Systems Outsourcing

Semantics of Agent-Based Service Delegation and Alignment

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