attack-stix-data
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STIX 2.1 Bundles don't use spec_version
Bundles in STIX 2.1 don't use the spec_version
property. From 2.0 to 2.1 spec_version
was moved to the objects so that a single bundle could hold objects of differing spec versions. Including it on the bundles may confuse some STIX implementations.
cc @chisholm