We have a property called viewers. This contains the user_id of all the viewers. This is a restricted system, so will have less than 100 users. This property would store all the viewers of the document.
In documentum, it was implemented as a repeated property.
It is a String type with Repeat attribute of the property set to Y.
I am new to Alfresco.
Can you give your suggestions, how one could implement this in Alfresco?