[This message was posted by Rolf Andersson of Pantor Engineering <[EMAIL 
PROTECTED]> to the "FAST Protocol" discussion forum at 
http://fixprotocol.org/discuss/46. You can reply to it on-line at 
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David, which feed are you referring to?
/Rolf

> In Fast 1.0, it was possible to assign two different fields (say,
> BID_PRICE and TRADE_PRICE) to the same PMAP slot, but different
> templates, with the particular template chosen at encode/decode time.
> So, a user could decode the first field (QUOTE_TRADE_INDICATOR, for
> example), and use its value to determine how a later field in the same
> message should be treated (continuing this example, as a BID_PRICE or a
> TRADE_PRICE).
> 
> How would you structure this in Fast 1.1 using the templates? It seems
> that you would need a template to become active during encoding or
> decoding, based on the VALUE of an already encoded/decoded field. This
> is different from a dynamic template, where the identifier of the
> template to be activated is explicitly coded in the stream.
> 
> The motivation behind this, by the way, is to try to decode an existing
> Fast 1.0 stream using a Fast 1.1 decoder. I believe that this could be
> done relatively easily if the non-existent Template Identifier field is
> skipped when encoding/decoding messages; but I have run into the issue
> described above.


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