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<?php
namespace SMW\Exporter\ResourceBuilders;
use SMW\DataValueFactory;
use SMW\DIProperty;
use SMWDataItem as DataItem;
use SMWDIUri as DIUri;
use SMWExpData as ExpData;
/**
* @private
*
* @license GNU GPL v2+
* @since 2.5
*
* @author mwjames
*/
class ExternalIdentifierPropertyValueResourceBuilder extends PropertyValueResourceBuilder {
/**
* @since 2.5
*
* {@inheritDoc}
*/
public function isResourceBuilderFor( DIProperty $property ) {
return $property->findPropertyTypeID() === '_eid';
}
/**
* Instead of representing an external identifier as "owl:sameAs", the weaker
* declarative axiom "skos:exactMatch" has been chosen to avoid potential
* issues with undesirable entailments.
*
* "skos:exactMatch" has been defined as "... indicating a high degree of
* confidence that the concepts can be used interchangeably across a wide
* range of information retrieval applications ..."
*
* @since 2.5
*
* {@inheritDoc}
*/
public function addResourceValue( ExpData $expData, DIProperty $property, DataItem $dataItem ) {
parent::addResourceValue( $expData, $property, $dataItem );
$dataValue = DataValueFactory::getInstance()->newDataValueByItem(
$dataItem,
$property
);
$uri = $dataValue->getUri();
if ( $uri instanceof DIUri ) {
$expData->addPropertyObjectValue(
$this->exporter->getSpecialNsResource( 'skos', 'exactMatch' ),
$this->exporter->getDataItemExpElement( $uri )
);
}
}
}
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