last reply date
type: DatatypeProperty
sub property of: date
range: Literal
comment: The date and time of the last reply Post or Comment, which could be associated with a starter Item or Post or with a Thread, and expressed in ISO 8601 format.

SIOC Core Ontology Namespace
type: Thing
type: Ontology
description: SIOC (Semantically-Interlinked Online Communities) is an ontology for describing the information in online communities. This information can be used to export information from online communities and to link them together. The scope of the application areas that SIOC can be used for includes (and is not limited to) weblogs, message boards, mailing lists and chat channels.
version info: Revision: 1.35

Post
type: Class
subclass of: Document
subclass of: Item
comment: An article or message that can be posted to a Forum.

Item
type: Class
disjoint with: Usergroup
disjoint with: User Account
disjoint with: Space
disjoint with: Role
disjoint with: Container
comment: An Item is something which can be in a Container.

attachment
type: ObjectProperty
domain: Item
comment: The URI of a file attached to an Item.

scope of
type: ObjectProperty
range: Role
comment: A Role that has a scope of this resource.
inverse of: has scope

Role
type: Class
disjoint with: Usergroup
disjoint with: User Account
disjoint with: Space
disjoint with: Item
disjoint with: Container
comment: A Role is a function of a UserAccount within a scope of a particular Forum, Site, etc.

has scope
type: ObjectProperty
domain: Role
comment: A resource that this Role applies to.
inverse of: scope of

Usergroup
type: Class
disjoint with: User Account
disjoint with: Space
disjoint with: Role
disjoint with: Item
disjoint with: Container
comment: A set of UserAccounts whose owners have a common purpose or interest. Can be used for access control purposes.

User Account
type: Class
comment: A user account in an online community site.
disjoint with: Space
disjoint with: Usergroup
disjoint with: Container
disjoint with: Item
disjoint with: Role
subclass of: OnlineAccount

Space
type: Class
disjoint with: Usergroup
disjoint with: User Account
disjoint with: Role
disjoint with: Item
comment: A Space is a place where data resides, e.g. on a website, desktop, fileshare, etc.

Container
type: Class
disjoint with: Usergroup
disjoint with: User Account
disjoint with: Role
disjoint with: Item
comment: An area in which content Items are contained.

description
type: DatatypeProperty
type: DeprecatedProperty
version info: This property is deprecated. Use sioc:content or other methods (AtomOwl, content:encoded from RSS 1.0, etc.) instead.
range: Literal
domain: Post
comment: The content of the Post.

function of
type: ObjectProperty
domain: Role
comment: A UserAccount that has this Role.
inverse of: has function

has function
type: ObjectProperty
range: Role
comment: A Role that this UserAccount has.
inverse of: function of

created at
type: DatatypeProperty
type: DeprecatedProperty
version info: This property is deprecated. Use dcterms:created from the Dublin Core ontology instead.
range: Literal
domain: Post
comment: When this was created, in ISO 8601 format.

group of
type: ObjectProperty
type: DeprecatedProperty
version info: This property has been renamed. Use sioc:usergroup_of instead.
inverse of: has group

has group
type: ObjectProperty
type: DeprecatedProperty
version info: This property has been renamed. Use sioc:has_usergroup instead.
inverse of: group of

content
type: DatatypeProperty
range: Literal
domain: Item
comment: The content of the Item in plain text format.

next version
type: ObjectProperty
sub property of: later version
range: Item
domain: Item
comment: Links to the next revision of this Item or Post.
inverse of: previous version

later version
type: TransitiveProperty
inverse of: earlier version
range: Item
domain: Item
comment: Links to a later (newer) revision of this Item or Post.

previous version
type: ObjectProperty
sub property of: earlier version
range: Item
domain: Item
comment: Links to the previous revision of this Item or Post.
inverse of: next version

reference
type: ObjectProperty
type: DeprecatedProperty
version info: Renamed to sioc:links_to.
domain: Post
comment: Links either created explicitly or extracted implicitly on the HTML level from the Post.

addressed to
type: ObjectProperty
domain: Item
comment: Refers to who (e.g. a UserAccount, e-mail address, etc.) a particular Item is addressed to.

has container
type: ObjectProperty
range: Container
domain: Item
comment: The Container to which this Item belongs.
inverse of: container of

container of
type: ObjectProperty
range: Item
domain: Container
comment: An Item that this Container contains.
inverse of: has container

link
type: ObjectProperty
comment: A URI of a document which contains this SIOC object.

owner of
type: ObjectProperty
domain: User Account
comment: A resource owned by a particular UserAccount, for example, a weblog or image gallery.
inverse of: has owner

has owner
type: ObjectProperty
range: User Account
comment: A UserAccount that this resource is owned by.
inverse of: owner of

first name
type: DatatypeProperty
type: DeprecatedProperty
version info: This property is deprecated. Use foaf:name or foaf:firstName from the FOAF vocabulary instead.
range: Literal
domain: User Account
comment: First (real) name of this User. Synonyms include given name or christian name.

links to
type: ObjectProperty
sub property of: references
comment: Links extracted from hyperlinks within a SIOC concept, e.g. Post or Site.

has member
type: ObjectProperty
range: User Account
domain: Usergroup
comment: A UserAccount that is a member of this Usergroup.
inverse of: member of

member of
type: ObjectProperty
range: Usergroup
domain: User Account
comment: A Usergroup that this UserAccount is a member of.
inverse of: has member

num items
type: DatatypeProperty
range: nonNegativeInteger
domain: Container
comment: The number of Posts (or Items) in a Forum (or a Container).

has reply
type: ObjectProperty
range: Item
domain: Item
comment: Points to an Item or Post that is a reply or response to this Item or Post.
sub property of: related to
inverse of: reply of

related to
type: ObjectProperty
comment: Related Posts for this Post, perhaps determined implicitly from topics or references.

reply of
type: ObjectProperty
range: Item
domain: Item
comment: Links to an Item or Post which this Item or Post is a reply to.
sub property of: related to
inverse of: has reply

next by date
type: ObjectProperty
range: Item
domain: Item
comment: Next Item or Post in a given Container sorted by date.
inverse of: previous by date

previous by date
type: ObjectProperty
range: Item
domain: Item
comment: Previous Item or Post in a given Container sorted by date.
inverse of: next by date

subject
type: DatatypeProperty
type: DeprecatedProperty
version info: This property is deprecated. Use dcterms:subject from the Dublin Core ontology for text keywords and sioc:topic if the subject can be represented by a URI instead.
range: Literal
domain: Post
comment: Keyword(s) describing subject of the Post.

has discussion
type: ObjectProperty
domain: Item
comment: The discussion that is related to this Item.

parent of
type: ObjectProperty
range: Container
domain: Container
comment: A child Container or Forum that this Container or Forum is a parent of.
inverse of: has parent

has parent
type: ObjectProperty
range: Container
domain: Container
comment: A Container or Forum that this Container or Forum is a child of.
inverse of: parent of

has moderator
type: ObjectProperty
range: User Account
domain: Forum
comment: A UserAccount that is a moderator of this Forum.

Forum
type: Class
subclass of: Container
comment: A discussion area on which Posts or entries are made.

latest version
type: ObjectProperty
range: Item
domain: Item
comment: Links to the latest revision of this Item or Post.

last activity date
type: DatatypeProperty
sub property of: date
range: Literal
comment: The date and time of the last activity associated with a SIOC concept instance, and expressed in ISO 8601 format. This could be due to a reply Post or Comment, a modification to an Item, etc.

account of
type: ObjectProperty
inverse of: account
range: Agent
domain: User Account
comment: Refers to the foaf:Agent or foaf:Person who owns this sioc:UserAccount.

earlier version
type: TransitiveProperty
inverse of: later version
range: Item
domain: Item
comment: Links to a previous (older) revision of this Item or Post.

last name
type: DatatypeProperty
type: DeprecatedProperty
version info: This property is deprecated. Use foaf:name or foaf:surname from the FOAF vocabulary instead.
range: Literal
domain: User Account
comment: Last (real) name of this user. Synonyms include surname or family name.

avatar
type: ObjectProperty
sub property of: depiction
domain: User Account
comment: An image or depiction used to represent this UserAccount.

has part
type: ObjectProperty
type: DeprecatedProperty
version info: This property is deprecated. Use dcterms:hasPart from the Dublin Core ontology instead.
comment: An resource that is a part of this subject.
inverse of: part of

part of
type: ObjectProperty
type: DeprecatedProperty
version info: This property is deprecated. Use dcterms:isPartOf from the Dublin Core ontology instead.
comment: A resource that the subject is a part of.
inverse of: has part

num authors
type: DatatypeProperty
range: nonNegativeInteger
comment: The number of unique authors (UserAccounts and unregistered posters) who have contributed to this Item, Thread, Post, etc.

host of
type: ObjectProperty
range: Forum
domain: Site
comment: A Forum that is hosted on this Site.
inverse of: has host

Site
type: Class
subclass of: Space
comment: A Site can be the location of an online community or set of communities, with UserAccounts and Usergroups creating Items in a set of Containers. It can be thought of as a web-accessible data Space.

has host
type: ObjectProperty
range: Site
domain: Forum
comment: The Site that hosts this Forum.
inverse of: host of

User
type: DeprecatedClass
disjoint with: Role
disjoint with: Space
disjoint with: Usergroup
disjoint with: Container
disjoint with: Item
equivalent class: User Account
version info: This class is deprecated. Use sioc:UserAccount from the SIOC ontology instead.
subclass of: OnlineAccount
comment: UserAccount is now preferred. This is a deprecated class for a User in an online community site.

Thread
type: Class
subclass of: Container
comment: A container for a series of threaded discussion Posts or Items.

topic
type: ObjectProperty
sub property of: subject
comment: A topic of interest, linking to the appropriate URI, e.g. in the Open Directory Project or of a SKOS category.

email
type: ObjectProperty
domain: User Account
comment: An electronic mail address of the UserAccount.

has modifier
type: ObjectProperty
range: User Account
domain: Item
comment: A UserAccount that modified this Item.
inverse of: modifier of

modifier of
type: ObjectProperty
range: Item
domain: User Account
comment: An Item that this UserAccount has modified.
inverse of: has modifier

id
type: DatatypeProperty
range: Literal
comment: An identifier of a SIOC concept instance. For example, a user ID. Must be unique for instances of each type of SIOC concept within the same site.

feed
type: ObjectProperty
comment: A feed (e.g. RSS, Atom, etc.) pertaining to this resource (e.g. for a Forum, Site, UserAccount, etc.).

has subscriber
type: ObjectProperty
range: User Account
domain: Container
comment: A UserAccount that is subscribed to this Container.
inverse of: subscriber of

subscriber of
type: ObjectProperty
range: Container
domain: User Account
comment: A Container that a UserAccount is subscribed to.
inverse of: has subscriber

note
type: DatatypeProperty
range: Literal
comment: A note associated with this resource, for example, if it has been edited by a UserAccount.

Community
type: Class
disjoint with: User Account
disjoint with: Role
disjoint with: Item
comment: Community is a high-level concept that defines an online community and what it consists of.

administrator of
type: ObjectProperty
range: Site
domain: User Account
comment: A Site that the UserAccount is an administrator of.
inverse of: has administrator

has administrator
type: ObjectProperty
range: User Account
domain: Site
comment: A UserAccount that is an administrator of this Site.
inverse of: administrator of

ip address
type: DatatypeProperty
range: Literal
domain: Item
comment: The IP address used when creating this Item. This can be associated with a creator. Some wiki articles list the IP addresses for the creator or modifiers when the usernames are absent.

SIOC Core Ontology Specification

last item date
type: DatatypeProperty
sub property of: date
range: Literal
domain: Container
comment: The date and time of the last Post (or Item) in a Forum (or a Container), in ISO 8601 format.

has space
type: ObjectProperty
range: Space
comment: A data Space which this resource is a part of.
inverse of: space of

space of
type: ObjectProperty
domain: Space
comment: A resource which belongs to this data Space.
inverse of: has space

sibling
type: SymmetricProperty
range: Item
domain: Item
comment: An Item may have a sibling or a twin that exists in a different Container, but the siblings may differ in some small way (for example, language, category, etc.). The sibling of this Item should be self-describing (that is, it should contain all available information).

email sha1
type: DatatypeProperty
range: Literal
domain: User Account
comment: An electronic mail address of the UserAccount, encoded using SHA1.

creator of
type: ObjectProperty
domain: User Account
comment: A resource that the UserAccount is a creator of.
inverse of: has creator

has creator
type: ObjectProperty
range: User Account
comment: This is the UserAccount that made this resource.
inverse of: creator of

title
type: DatatypeProperty
type: DeprecatedProperty
version info: This property is deprecated. Use dcterms:title from the Dublin Core ontology instead.
range: Literal
domain: Post
comment: This is the title (subject line) of the Post. Note that for a Post within a threaded discussion that has no parents, it would detail the topic thread.

about
type: ObjectProperty
domain: Item
comment: Specifies that this Item is about a particular resource, e.g. a Post describing a book, hotel, etc.

follows
type: ObjectProperty
range: User Account
domain: User Account
comment: Indicates that one UserAccount follows another UserAccount (e.g. for microblog posts or other content item updates).

embeds knowledge
type: ObjectProperty
range: Graph
domain: Item
comment: This links Items to embedded statements, facts and structured content.

moderator of
type: ObjectProperty
range: Forum
domain: User Account
comment: A Forum that a UserAccount is a moderator of.
inverse of: has moderator

modified at
type: DatatypeProperty
type: DeprecatedProperty
version info: This property is deprecated. Use dcterms:modified from the Dublin Core ontology instead.
range: Literal
domain: Post
comment: When this was modified, in ISO 8601 format.

num replies
type: DatatypeProperty
range: nonNegativeInteger
comment: The number of replies that this Item, Thread, Post, etc. has. Useful for when the reply structure is absent.

content encoded
type: DatatypeProperty
type: DeprecatedProperty
version info: This property is deprecated. Use content:encoded from the RSS 1.0 content module instead.
range: Literal
domain: Post
comment: The encoded content of the Post, contained in CDATA areas.

has usergroup
type: ObjectProperty
range: Usergroup
domain: Space
comment: Points to a Usergroup that has certain access to this Space.
inverse of: usergroup of

usergroup of
type: ObjectProperty
range: Space
domain: Usergroup
comment: A Space that the Usergroup has access to.
inverse of: has usergroup

num threads
type: DatatypeProperty
range: nonNegativeInteger
domain: Forum
comment: The number of Threads (AKA discussion topics) in a Forum.

name
type: DatatypeProperty
range: Literal
comment: The name of a SIOC concept instance, e.g. a username for a UserAccount, group name for a Usergroup, etc.

num views
type: DatatypeProperty
range: nonNegativeInteger
comment: The number of times this Item, Thread, UserAccount profile, etc. has been viewed.