Question: Do relationships include custom Attack properties?

[brettforbes]

Hi,

I am not 100% sure, whether relationships used in Attack, both existing Stix ones and new Attack ones, have additional attack-specific fields. Can you advise please?

I note that the table at this link (https://github.com/mitre-attack/attack-stix-data/blob/master/USAGE.md#extensions-of-the-stix-spec) says most of the attack-specific properties are not used by relationships. But two properties, "x_mitre_modified_by_ref" and "x_mitre_attack_spec_version" do not specifically prohibit relationships.

Can you advise please?? Do the relationships used by Attack, including the existing Stix ones and the additional attack ones, have Attack-specific property fields??

Thanks