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This repository contains non-normative JSON schemas and examples for STIX 2. The examples include short examples of particular objects, more complete use-case examples, and complete reports in STIX 2. The repository contains both JSON schemas and JSON STIX documents.

NOTE: The schemas in this repository are intended to follow the STIX 2.1 Specification, but some requirements of the specification cannot be enforced in JSON schema alone. As a result, these schemas are insufficient to determine whether a particular example of STIX 2.1 JSON is "valid". Additionally, though care has been taken to ensure that these schemas do not conflict with the specification, in case of conflict, the specification takes precedence.

Some of the checks the schemas do not contain:

• The 'modified' property must be later or equal to 'created'.
• Marking Definitions (both object markings and granular markings) cannot refer to themselves (no circular refs).
• IDs for custom object types must start with the name of that type.
• Granular Marking selectors must refer to properties or items actually present in the object.
• Object references in the Cyber Observable layer must be valid within the local scope.
• Custom observable objects and observable extensions must have at least one custom property.
• Values for some Cyber Observable object properties must come from official registries (eg. artifact:mime_type must be a valid IANA MIME type).
• Some Cyber Observable objects' *_ref and *_refs properties must point to specific types of objects (eg. process:image_ref must point to an object of type 'file').
• In patterns, an Observation Expression MUST NOT have more than one Qualifier of a particular type.

NOTE: If you need schemas for previous versions of the STIX 2 specification, see the Git branch corresponding to that version.

This GitHub public repository ( https://github.com/oasis-open/cti-stix2-json-schemas ) was proposed and approved [bis] by the the OASIS Cyber Threat Intelligence (CTI) TC as an OASIS TC Open Repository to support development of open source resources related to Technical Committee work.

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