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The Tool field specifies a single Tool leveraged by this TTP item.
The Type field under this field is implemented through the xsi:type controlled vocabulary extension mechanism. The default vocabulary type is AttackerToolTypeVocab-1.0 in the http://stix.mitre.org/default_vocabularies-1 namespace. This type is defined in the stix_default_vocabularies.xsd file or at the URL http://stix.mitre.org/XMLSchema/default_vocabularies/1.1.1/stix_default_vocabularies.xsd.
Users may also define their own vocabulary using the type extension mechanism, specify a vocabulary name and reference using the attributes, or simply use this as a string field.
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