MarketDataSnapshotFullRefresh/FIX.4.3

Message Content of MarketDataSnapshotFullRefresh (MsgType=W)

TagText	FieldName or ComponentName	Required	Description
	StandardHeader	x	MsgType = W
262	MDReqID		Conditionally required if this message is in response to a Market Data Request.
	Instrument	x	Insert here the set of "Instrument" (symbology) fields defined in "COMMON COMPONENTS OF APPLICATION MESSAGES"
291	FinancialStatus
292	CorporateAction
387	TotalVolumeTraded		Total volume traded in this trading session for this security.
449	TotalVolumeTradedDate
450	TotalVolumeTradedTime
451	NetChgPrevDay
268	NoMDEntries	x	Number of entries following.
269	MDEntryType	x	Must be the first field in this repeating group.
270	MDEntryPx		Conditionally required if MDEntryType is not Imbalance(A)
15	Currency		Can be used to specify the currency of the quoted price.
271	MDEntrySize		Conditionally required if MDEntryType = Bid(0), Offer(1), or Trade(2)
272	MDEntryDate
273	MDEntryTime
274	TickDirection
275	MDMkt		Market posting quote / trade. Valid values: See Appendix 6-C
336	TradingSessionID
625	TradingSessionSubID
276	QuoteCondition		Space-delimited list of conditions describing a quote.
277	TradeCondition		Space-delimited list of conditions describing a trade
282	MDEntryOriginator
283	LocationID
284	DeskID
286	OpenCloseSettleFlag		Used if MDEntryType = Opening Price(4), Closing Price(5), or Settlement Price(6).
59	TimeInForce		For optional use when this Bid or Offer represents an order
432	ExpireDate		For optional use when this Bid or Offer represents an order. ExpireDate and ExpireTime cannot both be specified in one Market Data Entry.
126	ExpireTime		For optional use when this Bid or Offer represents an order. ExpireDate and ExpireTime cannot both be specified in one Market Data Entry.
110	MinQty		For optional use when this Bid or Offer represents an order
18	ExecInst		Can contain multiple instructions, space delimited.
287	SellerDays
37	OrderID		For optional use when this Bid, Offer, or Trade represents an order
299	QuoteEntryID		For optional use when this Bid, Offer, or Trade represents a quote
288	MDEntryBuyer		For optional use in reporting Trades
289	MDEntrySeller		For optional use in reporting Trades
346	NumberOfOrders		In an Aggregated Book, used to show how many individual orders make up an MDEntry
290	MDEntryPositionNo		Display position of a bid or offer, numbered from most competitive to least competitive, per market side, beginning with 1
546	Scope
58	Text		Text to describe the Market Data Entry. Part of repeating group.
354	EncodedTextLen		Must be set if EncodedText field is specified and must immediately precede it.
355	EncodedText		Encoded (non-ASCII characters) representation of the Text field in the encoded format specified via the MessageEncoding field.
	StandardTrailer	x

Notes

Please post comments, clarifications, examples here. Click on the edit button on the right and away you go! 

Don't forget to refer to the FPL Discussion Groups to back up anything you write.
You will often find the authoritative statements on matters of FIX specification interpretation there.
Links from FIXwiki pages to relevant discussions on the FPL site are very valuable.

For example if you were writing a clarification on how to specify the "quantity" of an order in FIX, you might add the
following relevant link, http://www.fixprotocol.org/discuss/read/f5014573, to back up your points.