  This paper deals with the design of Excitation and Measurement Patterns
(EMPs) for the identification of dynamical networks, when the objective is to
identify only a subnetwork embedded in a larger network. Recent results have
shown how to construct EMPs that guarantee identifiability for a range of
networks with specific graph topologies, such as trees, loops, or Directed
Acyclic Graphs (DAGs). However, an EMP that is valid for the identification of
a subnetwork taken in isolation may no longer be valid when that subnetwork is
embedded in a larger network. Our main contribution is to exhibit conditions
under which it does remain valid, and to propose ways to enhance such EMP when
these conditions are not satisfied.
