https://www.w3.org/ns/activitystreams#

Actor accepts the Object

An Object representing some form of Action that has been taken

To Add an Object or Link to Something

Actor announces the object to the target

Represents a software application of any sort

To Arrive Somewhere (can be used, for instance, to indicate that a particular entity is currently located somewhere, e.g. a "check-in")

A written work. Typically several paragraphs long. For example, a blog post or a news article.

An audio file

An ordered or unordered collection of Objects or Links

A subset of items from a Collection

To Create Something

To Delete Something

The actor dislikes the object

Represents a digital document/file of any sort

An Event of any kind

To flag something (e.g. flag as inappropriate, flag as spam, etc)

To Express Interest in Something

A Group of any kind.

Actor is ignoring the Object

An Image file

An Activity that has no direct object

To invite someone or something to something

To Join Something

To Leave Something

To Like Something

Represents a qualified reference to another resource. Patterned after the RFC5988 Web Linking Model

The actor listened to the object

A specialized Link that represents an @mention

The actor is moving the object. The target specifies where the object is moving to. The origin specifies where the object is moving from.

A Short note, typically less than a single paragraph. A "tweet" is an example, or a "status update"

To Offer something to someone or something

A variation of Collection in which items are strictly ordered

An ordered subset of items from an OrderedCollection

A rdf:List variant for Objects and Links

An Organization

A Web Page

A Person

A physical or logical location

A Profile Document

"Public" audience from activitypub.

A question of any sort.

The actor read the object

Actor rejects the Object

Represents a Social Graph relationship between two Individuals (indicated by the 'a' and 'b' properties)

To Remove Something

A service provided by some entity

Actor tentatively accepts the Object

Actor tentatively rejects the object

A placeholder for a deleted object

The actor is traveling to the target. The origin specifies where the actor is traveling from.

To Undo Something. This would typically be used to indicate that a previous Activity has been undone.

To Update/Modify Something

A Video document of any kind.

The actor viewed the object

Specifies the accuracy around the point established by the longitude and latitude

Subproperty of as:attributedTo that identifies the primary actor

The altitude of a place

Describes a possible inclusive answer or option for a question.

Identifies an entity to which an object is attributed

Identifies the author of an object. Deprecated. Use as:attributedTo instead

The content of the object.

Specifies the context within which an object exists or an activity was performed

Specifies the date and time the object was deleted

On a Profile object, describes the object described by the profile

The duration of the object

The ending time of the object

On a Tombstone object, describes the former type of the deleted object

The display height expressed as device independent pixels

The target URI of the Link

A hint about the language of the referenced resource

Indentifies an object used (or to be used) to complete an activity

The latitude

The longitude

The MIME Media Type

Describes a possible exclusive answer or option for a question.

For certain activities, specifies the entity from which the action is directed.

Specifies the date and time the object was published

Specifies a radius around the point established by the longitude and latitude

A numeric rating (>= 0.0, <= 5.0) for the object

The RFC 5988 or HTML5 Link Relation associated with the Link

On a Relationship object, describes the type of relationship

In a strictly ordered logical collection, specifies the index position of the first item in the items list

The starting time of the object

On a Relationship object, identifies the subject. e.g. when saying "John is connected to Sally", 'subject' refers to 'John'

A short summary of the object

The total number of items in a logical collection

Identifies the unit of measurement used by the radius, altitude and accuracy properties. The value can be expressed either as one of a set of predefined units or as a well-known common URI that identifies units.

Specifies when the object was last updated

Specifies a link to a specific representation of the Object

Specifies the preferred display width of the content, expressed in terms of device independent pixels.