Restoring old revision of "Property:P856"

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@@ description / en / description / en @@
-official website of the subject
+URL of the official page of an item (current or former) [if the page changes, add an additional statement with preferred rank. Do not remove the former URL]
@@ Property / property constraint @@
-single-value constraint
@@ Property / property constraint: single-value constraint / rank @@
-Normal rank
@@ Property / property constraint @@
-format constraint
@@ Property / property constraint: format constraint / rank @@
-Normal rank
@@ Property / property constraint: format constraint / qualifier @@
-format as a regular expression: ^https?://.+