What is purpose of Identification number in IPv4 header when DNF flag is set?

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The identification number in the IPv4 header is used in packet fragmentation and re-assembly. If the "Do not fragment" flag is set, does the identification field has any significance?

Addition: Also, I see in Wireshark that whenever the DNF flag is set, Identification number is 0. Is that standardized or implementation dependant?

Wireshark Screenshot

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