Hello, I want to do the following: I create a class with one LongProperty field containing a long ID of another BaseObject. The idea is to link an object to another object by simply using its hashcode ID and not the whole docname+classname+nb string. A one-to-one association if you prefer. $xwiki.search("from BaseObject as obj...") will return a BaseObject so I can get the ID here. But in velocity, I access objects using $doc.getObject() which returns a Object API. I can't find any simple way to retrieve the ID of the nested BaseObject from Object API because getBaseObject requires programming rights. Do you have an idea for me? Is it mandatory to use the docname+classname+nb string to identify an object from velocity?