sequence fields

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Imported from previous forum

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Is there a preferred location for “sequence” fields? Should they be at the end of a message? Most implementations I’ve seen puts the “sequence” (repeating groups) at the end of message definition.

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From the FAST perspective sequence fields, or any field in general can be ordered freely. Reordering fields can affect the typical size of the presence map. If for example fields with a bit in a multibyte pmap that are often unset are grouped at the end of the message, it is more likely that truncation can be used yielding shorter encoded pmaps.

/David

Is there a preferred location for “sequence” fields? Should they be at
the end of a message? Most implementations I’ve seen puts the “sequence”
(repeating groups) at the end of message definition.