Overview

Entity types that define the structure of the graph itself.

Entity	Code	Definition	Boundaries
`Statement`	`00`	A record of a subject-property-object assertion.	Not a verified fact; verification is application-level. Not what it represents.
`DirectionalProperty`	`01`	A property where the ordered pair (subject, object) is semantically significant.	Use when reversing subject and object changes the meaning and produces a different Statement identity.
`SymmetricProperty`	`02`	A property where subject-object order is semantically interchangeable. Reversing subject and object preserves meaning and MUST resolve to the same canonical Statement identity.	Use when `A -> p -> B` means the same thing as `B -> p -> A`, such as identity or mutual-peer relations.

Entities with agency - they make decisions, take actions, and bear responsibility.

Entity	Code	Definition	Boundaries
`Person`	`10`	A person (alive, dead, undead, or fictional).	Not an account or organization.
`Organization`	`11`	A durable collective of people, software agents, or both that can act as a unit.	Not a single person or software agent. Legal incorporation is not required, but a legal company is always an Organization. A branded initiative, product line, or program is usually a Concept unless it has its own durable collective agency. Not a query-defined group.
`SoftwareAgent`	`12`	A running process that acts as an independent actor: bot, AI agent, smart contract. Can hold keys and sign.	Not a person or organization. Not static passive code (use CreativeWork for repos, images, logic).

Network addresses where evidence lives: resolvable locations, platform handles, and cryptographic principals.

Entity	Code	Definition	Boundaries
`NetworkResource`	`20`	A resource identified primarily by addressability or resolution, such as a URL, URI, or CID.	Not a subset or account. Not an inhabitable spatial context (use Place).
`PlatformAccount`	`21`	An authority-based account principal (e.g., an email address or a specific GitHub, Google, or Mastodon user ID). The identity exists by the permission of a host system's database.	Authenticated by a host authority's database. This represents the account principal itself, not the agent or agents that operate it.
`CryptographicAccount`	`22`	A math-based account principal (e.g., an EVM address, Bitcoin wallet, or did:key). The identity exists mathematically and is authenticated via mathematical signature keys.	Authenticated via mathematical signature keys, independent of a host authority.

Things that represent intellectual property, abstract ideas, or data structures.

Entity	Code	Definition	Boundaries
`CreativeWork`	`30`	The most generic kind of creative work, including books, movies, photographs, software programs, etc. Non-expressive digital artifacts (binaries, model weights, dataset snapshots) are CreativeWork with refinement via Statements (artifactKind, mediaType, generatedBy, derivedFrom).	Not a raw value or formal concept. Not a running agent instance (use SoftwareAgent). Not a resource where location is primary identifier (use NetworkResource).
`Concept`	`31`	A socially or formally recognized unit of meaning, such as a term, topic, category, label, initiative, or other abstract idea.	Not a plain raw value. Use this for labels, brands, programs, or initiatives that do not have their own durable collective agency.

Entities bounded in time; optionally in physical or virtual space. Substrate-neutral Places, Events, Actions, and physical Objects.

Entity	Code	Definition	Boundaries
`Place`	`40`	A spatial context that can contain presence, co-location, and interaction. Includes physical locations and persistent virtual environments (e.g., a concert venue, a Discord server or channel, a Zoom room, a VRChat instance). Physicality/virtuality is asserted via Statements, not the base type.	Not a happening or a physical artifact. Can an Actor have presence there? Is its identity a spatial address rather than a document location or account?
`Event`	`41`	An occurrence or happening bounded in time. Can be observed/aggregated; may be caused by Actions, systems, or nature. Occurs at a Place (physical or virtual).	Not a specific exertion of agency (Action).
`Action`	`42`	A discrete assertion or commitment attributable to an Agent. Often produces or records a change (e.g., a transaction, API call, signature). Can be linked to Events via Statements (causes, records, resultsIn).	Not a broad temporal happening (Event); must be driven by an Agent.
`PhysicalObject`	`43`	A tangible, inanimate physical object (e.g., hardware, vehicle, physical document, natural object). Physical only. Use Statements (madeBy, manufactured=true) if man-made vs natural matters.	Not a location (where). Not a digital artifact (use CreativeWork).

Typed scalar literals represented as first-class addressed values.

Entity	Code	Definition	Boundaries
`TextLiteral`	`a0`	A plain text sequence of characters.	Not a Concept.
`IntegerLiteral`	`a1`	A whole number.	Not a decimal or string.
`DecimalLiteral`	`a2`	A decimal or floating-point number.	Not an integer.
`BoolLiteral`	`a3`	A true or false value.	Not a number or string.
`DateTimeLiteral`	`b0`	A specific point in time in canonical UTC `YYYY-MM-DDTHH:MM:SSZ` form.	Not a date or time alone.
`DateLiteral`	`b1`	A calendar date in canonical `YYYY-MM-DD` form.	Not a datetime or time.
`YearMonthLiteral`	`b2`	A calendar year and month in canonical `YYYY-MM` form.	Not a full date or year alone.
`YearLiteral`	`b3`	A calendar year in canonical `YYYY` form.	Not a year-month or full date.
`TimeLiteral`	`b4`	A time of day (formatted according to ISO 8601, represented in UTC).	Not a date or datetime.
`DurationLiteral`	`b5`	A calculated amount of elapsed time (ISO 8601 duration format).	Not a datetime.
`URILiteral`	`c0`	A formalized Uniform Resource Identifier string.	Not plain text.
`JSONLiteral`	`c1`	A structured JSON object represented in canonical string form.	Not a string.