Nested Repeating Groups about fix-simple-binary-encoding HOT 7 CLOSED

Does the NumInGroup (number of entries) of the outer repeating group include an entry for the nested repeating group?

No, the NumInGroup of the outer group only give the number of occurrences of the outer group. The NumInGroup of the inner group gives its count. They are independent of each other.

Also while encoding do we have to first encode all entries of the outer repeating group followed by the nested repeating group?

No, what you have describe is breadth-first. Rather, a depth-first walk means you visit all nested groups of the first branch before moving to the second branch. If the groups were nested three deep, you would visit branch 1 of the outer group, then the first branch of the second level group, then all occurrences of the innermost group off of branch 1-1. Then the same pattern for branch 2 off the first branch of the outer group, etc. In other words, you go from trunk to the first leaf before going back to the second branch, and you follow the second branch all the way to its leaves before the third branch. Does that help explain it? If not, I guess a picture is needed.

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There is a picture here: https://en.wikipedia.org/wiki/Depth-first_search

If the diagram were a representation of a FIX message, each non-leaf node would contain a NumInGroup (group dimension).

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Hi Don,
Do you know if Real Logic SBE encoder supports nested repeating groups?

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@RFrenkel I believe the answer is yes, but you should post that question to real-logic/simple-binary-encoding.

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Got it thanks

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Yes the Real Logic SBE encoder does support nested repeating groups.

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Great! Thank you, Martin!

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