Description: link to the website of the company; Name: website 
Description: web site address where information about the product or contact is given; Name: adress of additional link
Description: The norm in fixed relation to the feature being described. This defines the parameters that influence the contents of the correlated feature. Type and number of the norm with issue year and issue month must be given, e.g. DIN ISO 4711:YYYY-MM.; Name: Reference norm of the connection, muff A2