diff --git a/iface/CMakeLists.txt b/iface/CMakeLists.txt
index c010c9d..12edc84 100644
--- a/iface/CMakeLists.txt
+++ b/iface/CMakeLists.txt
@@ -15,8 +15,10 @@ target_sources(nf7_iface
     common/observer.hh
     common/task.hh
     common/value.hh
+    data/interface.hh
     subsys/interface.hh
     env.hh
+    file.hh
     lambda.hh
     version.hh
 )
diff --git a/iface/data/interface.hh b/iface/data/interface.hh
new file mode 100644
index 0000000..b43b7f1
--- /dev/null
+++ b/iface/data/interface.hh
@@ -0,0 +1,23 @@
+// No copyright
+#pragma once
+
+namespace nf7::data {
+
+class Interface {
+ public:
+  Interface() = delete;
+  explicit Interface(const char* name) : name_(name) { }
+  virtual ~Interface() = default;
+
+  Interface(const Interface&) = delete;
+  Interface(Interface&&) = delete;
+  Interface& operator=(const Interface&) = delete;
+  Interface& operator=(Interface&&) = delete;
+
+  const char* name() const noexcept { return name_; }
+
+ private:
+  const char* name_;
+};
+
+}  // namespace nf7::data
diff --git a/iface/file.hh b/iface/file.hh
new file mode 100644
index 0000000..c8e2c1d
--- /dev/null
+++ b/iface/file.hh
@@ -0,0 +1,11 @@
+// No copyright
+#pragma once
+
+#include "iface/common/container.hh"
+#include "iface/data/interface.hh"
+
+namespace nf7 {
+
+using File = Container<data::Interface>;
+
+}  // namespace nf7