在PL / SQL中创建动态对象

I'm pretty new to PL/SQL and currently I have the need for a specific functionality, which I suspect to not being doable with PL/SQL. I am bound to using PL/SQL, so hints on other programming ('query') languages will unfortunately be of no use to me. Therefore I'd like to ask, whether it is possible to create instances of user-defined types in PL/SQL during program flow and not only within the DECLARE block, and in case it is possible, I'd like to know how to do it.I'm pretty new to PL/SQL and currently I have t