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| Property | Expected type | Description |
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| source one | Text | The source system that describes the entity or action, such as things-todo. |
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| sourceId one | Text | The identifier assigned by the source to an entity or action, such as a record ID or message ID. |
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| Property | Expected type | Description |
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| agent one | Agent | The doer of the action, when identified by the source. |
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| instrument one | Entity | The tool, device, application, or model used to perform an action. |
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| object one | Entity | The entity an action is carried out on, such as the article being read, the message being sent, or the place being visited. |
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| timestamp one | DateTime | The instant when the action occurred, as reported by the source. |
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| Property | Expected type | Description |
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| about many | Entity | An entity representing the subject matter of this entity, such as a topic or tag describing what a task concerns. |
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| body one | Text | The textual content of an entity, such as a shell command or message, as supplied by the source. |
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| description one | Text | Descriptive text supplied by the source about an entity, such as a task's notes or a project's summary. |
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| handle one | Text | A contextual identifier for an entity within its namespace, such as a username, channel slug, or tag label. |
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| inRealm one | Realm | The realm in which an entity resides, such as the computer system hosting a conversation or file. |
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| isPartOf many | Entity | An entity that this entity forms part of, such as a task's project or collection, or the page containing an excerpt. |
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| name one | Text | The human-readable name or title of an entity, such as a person's display name, a document title, or a place name. |
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| sameAs many | Entity or Text | Another reference to the same entity, expressed as an entity node or a textual identity reference such as @me. |
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| url one | URL | A URL at which the entity can be found, such as a web page's address or a link to a source record. |
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| Property | Expected type | Description |
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| memberOf many | Entity | An entity the agent belongs to, such as a realm representing the computer system in which a user account exists. |
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| Property | Expected type | Description |
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| author many | Agent | An agent that authored the message content, such as a person or software assistant. |
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| contains many | MediaObject | A media artifact carried by a message, such as an attached image, voice recording, video, or document. |
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| recipient many | Agent | An agent the message was directed to. |
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