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"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by Semantic MediaWiki.

"Allows value" is a predefined property that can define a list of permissible values to restrict value assignments for a property and is provided by Semantic MediaWiki.

"Has type" is a predefined property that describes the datatype of a property and is provided by Semantic MediaWiki.