Data Requirements
Data Quality Rule | Definition | Example | [DQ-Constraint Lib http://semwebquality.org/ontologies/dq-constraints#] for SPIN |
---|---|---|---|
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 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
Outdated Value Rules | Outdated value rules are rules that
identify instances that represent an outdated state of the corresponding real world entity.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 |