[This message was posted by Jacob Northey of The LaSalle Technology Group 
<[EMAIL PROTECTED]> to the "FAST Protocol" discussion forum at 
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My vote is for the following implementation

 1. Map should not be able to combine with other operators
 2. The presence bit should indicate reference or definition
 3. Nullable fields should be encoded as a 0 presence bit and a zero reference

Example:

1. Defining a new value:

PBIT: 1
ENCODING: 0x81 0x49 0x42 0xCD

Store the value "IBM" into cache index 1.  Set field value to "IBM"

2. Referencing a value:

PBIT: 0
ENCODING: 0x81

Set field value to cached value "IBM"

3. Sending a null value:

PBIT: 0
ENCODING: 0x80

Set field value to null

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