-XBT_PUBLIC_DATA(const char*) MSG_vm_get_property_value(msg_vm_t vm, const char *name);
-XBT_PUBLIC_DATA(xbt_dict_t) MSG_vm_get_properties(msg_vm_t vm);
-XBT_PUBLIC_DATA(void) MSG_vm_set_property_value(msg_vm_t vm, const char *name, void *value, void_f_pvoid_t free_ctn);
-XBT_PUBLIC_DATA(msg_vm_t) MSG_vm_get_by_name(const char *name);
-XBT_PUBLIC_DATA(const char*) MSG_vm_get_name(msg_vm_t vm);
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