The URL (Uniform Resource Locator) that identifies where the external document is located.
A means of locating the resource, including its primary access mechanism, e.g. http:// or ftp://.
SB-IBT-124
1..1
cbc:URI
urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2
http://www.example.com/index.html