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Hi,

To my understanding message definitions are used to generate POD structures. A recursive definition would generate an infinite structure, e.g. in C++ :

struct Node
{
  Node neighbor;
};

Note that an array of Node should do the trick but it seems it does not compile either, though the C++ version is fine:

struct Node
{
  std::vector<Node> neighbors;
};

In your case one could suggest an array of id's to represent the neighbors of the node.