--- /dev/null
+Interfaces and Files
+--------------------
+
+This section describes the required interfaces and files of Escalator.
+
+
+CLI Interface
+~~~~~~~~~~~~~~~~
+
+This section describes CLI of Escalator.
+
+RESTful API
+~~~~~~~~~~~
+
+This section describes the API of Escalator for developer.
+
+Configuration File
+~~~~~~~~~~~~~~~~~~
+
+This section will suggest a format of the configuration files and how to
+deal with it.
+
+Log File
+~~~~~~~~
+
+This section will suggest a format of the log files and how to deal with
+it.
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