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-===========
-Terminology
-===========
-
-A list of definitions of specific terminology used among these documents.
-These terms were originally taken from the server-server documentation, and may
-not currently match the exact meanings used in other places; though as a
-medium-term goal we should encourage the unification of this terminology.
-
-
-Terms
-=====
-
-Backfilling:
-  The process of synchronising historic state from one home server to another,
-  to backfill the event storage so that scrollback can be presented to the
-  client(s).  (Formerly, and confusingly, called 'pagination')
-
-Context:
-  A single human-level entity of interest (currently, a chat room)
-
-EDU (Ephemeral Data Unit):
-  A message that relates directly to a given pair of home servers that are
-  exchanging it. EDUs are short-lived messages that related only to one single
-  pair of servers; they are not persisted for a long time and are not forwarded
-  on to other servers. Because of this, they have no internal ID nor previous
-  EDUs reference chain.
-
-Event:
-  A record of activity that records a single thing that happened on to a context
-  (currently, a chat room). These are the "chat messages" that Synapse makes
-  available.
-  [[NOTE(paul): The current server-server implementation calls these simply
-  "messages" but the term is too ambiguous here; I've called them Events]]
-
-PDU (Persistent Data Unit):
-  A message that relates to a single context, irrespective of the server that
-  is communicating it. PDUs either encode a single Event, or a single State
-  change. A PDU is referred to by its PDU ID; the pair of its origin server
-  and local reference from that server.
-
-PDU ID:
-  The pair of PDU Origin and PDU Reference, that together globally uniquely
-  refers to a specific PDU.
-
-PDU Origin:
-  The name of the origin server that generated a given PDU. This may not be the
-  server from which it has been received, due to the way they are copied around
-  from server to server. The origin always records the original server that
-  created it.
-
-PDU Reference:
-  A local ID used to refer to a specific PDU from a given origin server. These
-  references are opaque at the protocol level, but may optionally have some
-  structured meaning within a given origin server or implementation.
-
-Presence:
-  The concept of whether a user is currently online, how available they declare
-  they are, and so on. See also: doc/model/presence
-
-Profile:
-  A set of metadata about a user, such as a display name, provided for the
-  benefit of other users. See also: doc/model/profiles
-
-Room ID:
-  An opaque string (of as-yet undecided format) that identifies a particular
-  room and used in PDUs referring to it.
-
-Room Alias:
-  A human-readable string of the form #name:some.domain that users can use as a
-  pointer to identify a room; a Directory Server will map this to its Room ID
-
-State:
-  A set of metadata maintained about a Context, which is replicated among the
-  servers in addition to the history of Events.
-
-User ID:
-  A string of the form @localpart:domain.name that identifies a user for
-  wire-protocol purposes. The localpart is meaningless outside of a particular
-  home server. This takes a human-readable form that end-users can use directly
-  if they so wish, avoiding the 3PIDs.
-
-Transaction:
-  A message which relates to the communication between a given pair of servers.
-  A transaction contains possibly-empty lists of PDUs and EDUs.
-