SMWSomeProperty Class Reference
[SMWQuery]

Description of a set of instances that have an attribute with some value that fits another (sub)description. More...

Inherits SMWDescription.

List of all members.

Public Member Functions
	__construct (SMWDIProperty $property, SMWDescription $description)
	getProperty ()
	getDescription ()
	getQueryString ($asvalue=false)
	Return a string expressing this query.
	isSingleton ()
	Return true if the description is required to encompass at most a single result, independently of the knowledge base.
	getSize ()
	Compute the size of the decription.
	getDepth ()
	Compute the depth of the decription.
	getQueryFeatures ()
	Report on query features used in description.
	prune (&$maxsize, &$maxdepth, &$log)
	Recursively restrict query to a maximal size and depth as given.
Protected Attributes
	$m_description
	$m_property

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Detailed Description

Description of a set of instances that have an attribute with some value that fits another (sub)description.

Corresponds to existential quatification ("SomeValuesFrom" restriction) on properties in OWL. In conjunctive queries (OWL) and SPARQL (RDF), it is represented by using variables in the object part of such properties.

Definition at line 745 of file SMW_Description.php.

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Constructor & Destructor Documentation

SMWSomeProperty::__construct	(	SMWDIProperty $	property,
		SMWDescription $	description
	)

Definition at line 750 of file SMW_Description.php.

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Member Function Documentation

SMWSomeProperty::getProperty

(

)

Definition at line 755 of file SMW_Description.php.

Referenced by SMWSparqlStoreQueryEngine::buildPropertyCondition().

SMWSomeProperty::getDescription

(

)

Definition at line 759 of file SMW_Description.php.

Referenced by getDepth(), and getSize().

SMWSomeProperty::getQueryString

(

$

asvalue = false

)

Return a string expressing this query.

Some descriptions have different syntax in property value positions. The parameter $asvalue specifies whether the serialisation should take that into account.

Example: The SMWValueDescription [[Paris]] returns the single result "Paris" but can also be used as value in [[has location::Paris]] which is preferred over the canonical [[has location::<q>[[Paris]]</q>]].

Parameters:

boolean

$asvalue

Returns:

string

Reimplemented from SMWDescription.

Definition at line 763 of file SMW_Description.php.

Referenced by prune().

SMWSomeProperty::isSingleton

(

)

Return true if the description is required to encompass at most a single result, independently of the knowledge base.

Returns:

boolean

Reimplemented from SMWDescription.

Definition at line 783 of file SMW_Description.php.

SMWSomeProperty::getSize

(

)

Compute the size of the decription.

Default is 1.

Returns:

integer

Reimplemented from SMWDescription.

Definition at line 787 of file SMW_Description.php.

References getDescription().

SMWSomeProperty::getDepth

(

)

Compute the depth of the decription.

Default is 0.

Returns:

integer

Reimplemented from SMWDescription.

Definition at line 791 of file SMW_Description.php.

References getDescription().

SMWSomeProperty::getQueryFeatures

(

)

Report on query features used in description.

Return values are (sums of) query feature constants such as SMW_PROPERTY_QUERY.

Reimplemented from SMWDescription.

Definition at line 795 of file SMW_Description.php.

SMWSomeProperty::prune	(	&$	maxsize,
		&$	maxdepth,
		&$	log
	)

Recursively restrict query to a maximal size and depth as given.

Returns a possibly changed description that should be used as a replacement. Reduce values of parameters to account for the returned descriptions size. Default implementation for non-nested descriptions of size 1. The parameter $log contains a list of all pruned conditions, updated when some description was reduced.

Note:

Objects must not do changes on $this during pruning, since $this can be reused in multiple places of one or many queries. Make new objects to reflect changes!

Reimplemented from SMWDescription.

Definition at line 799 of file SMW_Description.php.

References SMWDescription::getPrintRequests(), and getQueryString().

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Member Data Documentation

SMWSomeProperty::$m_description [protected]

Definition at line 747 of file SMW_Description.php.

SMWSomeProperty::$m_property [protected]

Definition at line 748 of file SMW_Description.php.

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The documentation for this class was generated from the following file:

• SemanticMediaWiki/includes/storage/SMW_Description.php