1 files changed, 48 insertions, 0 deletions
diff --git a/www/wiki/extensions/SemanticMediaWiki/src/Exporter/ResourceBuilders/UniquenessConstraintPropertyValueResourceBuilder.php b/www/wiki/extensions/SemanticMediaWiki/src/Exporter/ResourceBuilders/UniquenessConstraintPropertyValueResourceBuilder.php
new file mode 100644
index 00000000..40d4f55a
--- /dev/null
+++ b/www/wiki/extensions/SemanticMediaWiki/src/Exporter/ResourceBuilders/UniquenessConstraintPropertyValueResourceBuilder.php
@@ -0,0 +1,48 @@
+<?php
+
+namespace SMW\Exporter\ResourceBuilders;
+
+use SMW\DIProperty;
+use SMWDataItem as DataItem;
+use SMWExpData as ExpData;
+
+/**
+ * @private
+ *
+ * @license GNU GPL v2+
+ * @since 2.5
+ *
+ * @author mwjames
+ */
+class UniquenessConstraintPropertyValueResourceBuilder extends PropertyValueResourceBuilder {
+
+	/**
+	 * @since 2.5
+	 *
+	 * {@inheritDoc}
+	 */
+	public function isResourceBuilderFor( DIProperty $property ) {
+		return $property->getKey() === '_PVUC';
+	}
+
+	/**
+	 * @since 2.5
+	 *
+	 * {@inheritDoc}
+	 */
+	public function addResourceValue( ExpData $expData, DIProperty $property, DataItem $dataItem ) {
+
+		parent::addResourceValue( $expData, $property, $dataItem );
+
+		// https://www.w3.org/TR/2004/REC-owl-ref-20040210/#FunctionalProperty-def
+		//
+		// "A functional property is a property that can have only one (unique)
+		// value y for each instance x ..."
+
+		$expData->addPropertyObjectValue(
+			$this->exporter->getSpecialNsResource( 'rdf', 'type' ),
+			$this->exporter->getSpecialNsResource( 'owl', 'FunctionalProperty' )
+		);
+	}
+
+}