Data Requirements
Line 14: | Line 14: | ||
class foo:Location to be able to | class foo:Location to be able to | ||
navigate to each location. | navigate to each location. | ||
+ | |[http://semwebquality.org/ontologies/dq-constraints#MissingElementConstraints] | ||
+ | [http://semwebquality.org/ontologies/dq-constraints#FunctionalDependentEmptyValueAll] | ||
|- | |- | ||
|Syntactic Rules | |Syntactic Rules | ||
Line 22: | Line 24: | ||
foo:country-name must only | foo:country-name must only | ||
contain letters. | contain letters. | ||
+ | | | ||
|- | |- | ||
|Functional Dependency Rules | |Functional Dependency Rules |
Revision as of 18:43, 9 August 2011
Data Quality Rule | Definition | Example | DQ-Constraint |
---|---|---|---|
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. |
[1] |
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. |
|
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. | |
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”. | |
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. | |
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”. | |
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. | |
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. | |
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. |