Data Requirements
From SemWebQuality.org
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+ | A data requirement is a prescribed directive or consensual agreement that defines the content and/or structure that constitute high quality data instances and values. The following table contains different types of data requirements that can be expressed via the [http://semwebquality.org/ontologies/dq-constraints# DQ-Constraint Library] or the [http://purl.org/dqm-vocabulary/v1/dqm# DQM-Vocabulary]. | ||
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+ | |+ Types of Data Requirements | ||
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!Data Quality Rule | !Data Quality Rule | ||
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Latest revision as of 20:46, 10 October 2011
This site is currently under construction!
A data requirement is a prescribed directive or consensual agreement that defines the content and/or structure that constitute high quality data instances and values. The following table contains different types of data requirements that can be expressed via the DQ-Constraint Library or the DQM-Vocabulary.
Data Quality Rule | Definition | Example | DQ-Constraint Lib for SPIN | DQM-Vocabulary |
---|---|---|---|---|
Mandatory Property and Literal Rules | Properties and their literals become mandatory, if the data is required for the task at hand. | The properties indicating the geographical coordinates must exist and have values for all instances of the class foo:Location to be able to navigate to each location. | dqc:MissingElementConstraints | dqm:PropertyCompletenessRule |
Syntactic Rules | Syntactic rules define the type of characters and/or the pattern of literal values. | Literal values for the property foo:country-name must only contain letters. | dqc:SyntaxConstraints | dqm:SyntaxRule |
Functional Dependency Rules | Functional dependencies are dependencies between the values of two or more different properties. | The literal value for foo:city is always dependent to the literal value for foo:country, since certain city names only exist in certain countries. | dqc:FunctionalDependencyConstraints | dqm:FuncDepValueRule |
Legal Value Rules | Legal value rules are the explicit definition of the allowed values for a certain property. | The property foo:gender must only contain the values “male”, “female”, “m”, or “f”. | dqc:LegalValueConstraints | dqm:LegalValueRule |
Legal Value Range Rules | Legal value range rules are the explicit definition of the allowed value range for properties holding numerical values. A value range contains an upper and/or lower limit. | The property foo:population must only contain values greater than zero. | dqc:ValueRangeConstraints | dqm:LegalValueRangeRule |
Illegal Value Rules | Illegal value rules are the explicit definition of the values that may not be assigned to a certain property. | The property foo:gender may never contain the value “mail”. | dqc:LegalValueConstraints | dqm:IllegalValueRule |
Illegal Value Range Rules | Illegal value range rules are the explicit definition of prohibited value ranges for properties holding numerical values. A value range contains an upper and/or lower limit. | The property foo:population must not contain values less than one. | dqc:ValueRangeConstraints | dqm:IllegalValueRangeRule |
Unique Value Rules | Unique value rules define properties that may contain each literal value not more than once within a defined collection of values. | Each value for property foo:ISBN in instances of class foo:Book may not occur more than once. | dqc:UniquenessConstraints | dqm:UniqueValueRule |
Outdated Value Rules | Outdated value rules are rules that identify instances that represent an outdated state of the corresponding real world entity. | Instances of the class foo:Offer are outdated, if its value for foo:validThrough is elder than the current date and time. | Not covered yet | dqm:UpdateRule |
Duplicate Instance Rules | Not covered yet | dqm:DuplicateInstanceRule |