Generation of external schemas in ODMG databases

Torres, Manuel; Samos, José

doi:10.1109/ideas.2001.938074

Cited by 4 publications

(8 citation statements)

References 10 publications

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“…Therefore, existing inheritance relationships between classes and interfaces of the schema must be obtained when derived classes and derived interfaces are included in external schemas. For such a purpose an external schema generation algorithm [Torres01a] is used, which obtains the existing relationships between derived classes and the remainder set of classes of the external schema. External schema specification is carried out by means of the external schema definition language proposed in this paper.…”

Section: Overview Of Our External Schema Definition Methodology For Omentioning

confidence: 99%

“…Besides, a new defining scope for the external schema with their components, as well as instances corresponding to EXTENDS relationships has also been created. In [Torres01a] the schema generation algorithm for obtaining the EXTENDS relationship existing between Client and People in the external schema is described. It can also be seen that the external schema includes all the classes specified by the schema definer but no class is defined in such a schema.…”

Section: Component-level Operationsmentioning

confidence: 99%

“…The specification must allow the selection of schema components, derived or not, returning the set of classes and interfaces that initially make up an external schema. It is an initial set because that set may be modified later in schema closure [Torres01b] and schema generation [Torres01a] steps. The specification process updates the repository adding or modifying the corresponding instances in the related metaclasses (e.g.…”

Section: External Schema Specificationmentioning

confidence: 99%

“…First, schema definers specify the classes to be included in external schemas; second, schemas are closed so that, classes do not have references to classes that are not included in the schema; third, schemas are generated obtaining inheritance relationships instead of specifying them manually, avoiding the introduction of mistakes. Schema closure and schema generation are studied in [Torres01b,Torres01a] respectively.…”

Section: Introductionmentioning

confidence: 99%

“…In order to provide ODMG with that functionality, we have developed an external schema definition methodology for ODMG databases [Torres02]. This methodology allows database administrators to define external schemas in a three-step process.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

A Language to Define External Schemas in ODMG Databases.

Torres¹,

Samos²

2004

JOT

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ODMG is the de facto standard for object-oriented databases (OODB) but does not address the definition of external schemas. In order to provide such functionality, we have developed an external schema definition methodology that allows the definition of external schemas in ODMG databases. In this work, the language used by the schema definer to specify the schema components (e.g. classes, interfaces, and so on) is proposed. Besides, we describe the effect caused on the ODMG schema repository by the definition of external schemas using the proposed language.

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Section: Overview Of Our External Schema Definition Methodology For Omentioning

confidence: 99%

Section: Component-level Operationsmentioning

confidence: 99%

Section: External Schema Specificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Language to Define External Schemas in ODMG Databases.

Torres¹,

Samos²

2004

JOT

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A Methodology to Define External Schemas in ODMG Databases

Torres

Samos

2005

The Computer Journal

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The ODMG standard is a proposal to solve one of the main drawbacks of object-oriented databases (OODBs): the lack of a standard for object definition and management. Nevertheless, this standard does not offer a solution for another lack of OODBs, related to the definition of external schemas. In this work, a methodology to define external schemas in ODMG databases is put forward. This methodology proposes a solution for the tasks involved-specification, closure and generation of external schemas-introducing also an extension of ODMG metadata to enable the definition of external schemas in ODMG databases.

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A novel inheritance mechanism for modeling knowledge representation systems

Krótkiewicz

2018

ComSIS

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The mechanism of inheritance is a powerful tool used to describe complexity of a reality fraction. It is particularly important for knowledge representation systems modelling. It provides a specific ability to take over properties from a base element, what is crucial for conciseness, and modelling efficiency as well. In the Association-Oriented Database Metamodel, inheritance retains coherence with the object-oriented model in the most general terms. However, it has been otherwise defined which stems from the specificity of the metamodel, and particularly from its capabilities which have blazed a trail for its further extension. The main contribution of this article is a description of preliminary assumptions, postulates and conceptual solutions applicable to inheritance. They have been discussed against the background of the Association-Oriented Database Metamodel as well as an objectoriented model compared with the former.

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Generation of external schemas in ODMG databases

Cited by 4 publications

References 10 publications

A Language to Define External Schemas in ODMG Databases.

A Language to Define External Schemas in ODMG Databases.

A Methodology to Define External Schemas in ODMG Databases

A novel inheritance mechanism for modeling knowledge representation systems

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