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	synapse/app/homeserver.py

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+Matrix Specification NOTHAVEs
+=============================
+
+This document contains sections of the main specification that have been
+temporarily removed, because they specify intentions or aspirations that have
+in no way yet been implemented. Rather than outright-deleting them, they have
+been moved here so as to stand as an initial version for such time as they
+become extant.
+
+
+Presence
+========
+
+Idle Time
+---------
+As well as the basic ``presence`` field, the presence information can also show
+a sense of an "idle timer". This should be maintained individually by the
+user's clients, and the home server can take the highest reported time as that
+to report. When a user is offline, the home server can still report when the
+user was last seen online.
+
+Device Type
+-----------
+
+Client devices that may limit the user experience somewhat (such as "mobile"
+devices with limited ability to type on a real keyboard or read large amounts of
+text) should report this to the home server, as this is also useful information
+to report as "presence" if the user cannot be expected to provide a good typed
+response to messages.
+