On building support of digital twin concept for smart spaces

Inherited from industry 4.0 domain, digital twin concept will represent an important step forward in what we have understood as smart city concept. In this paper we present our ongoing work on extending a monitoring smart city middleware to a digital twin platform for smart cities. The reader will learn some key issues of this new concept in the field of smart cities including some open questions that need to be investigated about the user interaction with digital twin concept.