AEM 6.3 Page Reference APIs

[RonnieForum]

I am trying to find below references in a Page. 

• DAM Assets
• Tags
• Templates
• Blueprint

I am using AssetReferenceSearch class to find DAM Assets references. Similar to this are there any other classes that can be used to retrieve rest of the references ? 

While we publish a page, it lists all references which are not published. So there must be some mechanism to achieve this. ActivationReferenceSearchServlet seems to be using it but not getting how to extend this class in my custom class. 

Any thoughts?