* always initialize all members. Better safe than sorry.
* Ownership of the member pointees: rule of thumb: "const" pointees are non-owned, non-const pointees are owned by the data structure. Exceptional cases are documented explicitly.
## API
## Public API
* defined in `namespace pEp`– Beware: it is shared with libpEpAdapter!)
* header files are installed in `PREFIX/include/pEp/` and are used via `#include <pEp/filename.hh>`– (Also shared with libpEpAdapter!)
* the linked list datatypes implement the API of [`std::forward_list`](https://en.cppreference.com/w/cpp/container/forward_list)
