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.
SIOC Core Ontology Namespace
Community is a high-level concept that defines an online community and what it consists of.
Community
An area in which content Items are contained.
Container
A discussion area on which Posts or entries are made.
Forum
An Item is something which can be in a Container.
Item
An article or message that can be posted to a Forum.
Post
A Role is a function of a UserAccount within a scope of a particular Forum, Site, etc.
Role
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.
Site
A Space is a place where data resides, e.g. on a website, desktop, fileshare, etc.
Space
A container for a series of threaded discussion Posts or Items.
Thread
UserAccount is now preferred. This is a deprecated class for a User in an online community site.
User
This class is deprecated. Use sioc:UserAccount from the SIOC ontology instead.
A user account in an online community site.
User Account
A set of UserAccounts whose owners have a common purpose or interest. Can be used for access control purposes.
Usergroup
Specifies that this Item is about a particular resource, e.g. a Post describing a book, hotel, etc.
about
Refers to the foaf:Agent or foaf:Person who owns this sioc:UserAccount.
account of
Refers to who (e.g. a UserAccount, e-mail address, etc.) a particular Item is addressed to.
addressed to
A Site that the UserAccount is an administrator of.
administrator of
The URI of a file attached to an Item.
attachment
An image or depiction used to represent this UserAccount.
avatar
An Item that this Container contains.
container of
The content of the Item in plain text format.
content
The encoded content of the Post, contained in CDATA areas.
content encoded
This property is deprecated. Use content:encoded from the RSS 1.0 content module instead.
When this was created, in ISO 8601 format.
created at
This property is deprecated. Use dcterms:created from the Dublin Core ontology instead.
A resource that the UserAccount is a creator of.
creator of
The content of the Post.
description
This property is deprecated. Use sioc:content or other methods (AtomOwl, content:encoded from RSS 1.0, etc.) instead.
Links to a previous (older) revision of this Item or Post.
earlier version
An electronic mail address of the UserAccount.
email
An electronic mail address of the UserAccount, encoded using SHA1.
email sha1
This links Items to embedded statements, facts and structured content.
embeds knowledge
A feed (e.g. RSS, Atom, etc.) pertaining to this resource (e.g. for a Forum, Site, UserAccount, etc.).
feed
First (real) name of this User. Synonyms include given name or christian name.
first name
This property is deprecated. Use foaf:name or foaf:firstName from the FOAF vocabulary instead.
Indicates that one UserAccount follows another UserAccount (e.g. for microblog posts or other content item updates).
follows
A UserAccount that has this Role.
function of
group of
This property has been renamed. Use sioc:usergroup_of instead.
A UserAccount that is an administrator of this Site.
has administrator
The Container to which this Item belongs.
has container
This is the UserAccount that made this resource.
has creator
The discussion that is related to this Item.
has discussion
A Role that this UserAccount has.
has function
has group
This property has been renamed. Use sioc:has_usergroup instead.
The Site that hosts this Forum.
has host
A UserAccount that is a member of this Usergroup.
has member
A UserAccount that is a moderator of this Forum.
has moderator
A UserAccount that modified this Item.
has modifier
A UserAccount that this resource is owned by.
has owner
A Container or Forum that this Container or Forum is a child of.
has parent
An resource that is a part of this subject.
has part
This property is deprecated. Use dcterms:hasPart from the Dublin Core ontology instead.
Points to an Item or Post that is a reply or response to this Item or Post.
has reply
A resource that this Role applies to.
has scope
A data Space which this resource is a part of.
has space
A UserAccount that is subscribed to this Container.
has subscriber
Points to a Usergroup that has certain access to this Space.
has usergroup
A Forum that is hosted on this Site.
host of
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.
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.
ip address
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.
last activity date
The date and time of the last Post (or Item) in a Forum (or a Container), in ISO 8601 format.
last item date
Last (real) name of this user. Synonyms include surname or family name.
last name
This property is deprecated. Use foaf:name or foaf:surname from the FOAF vocabulary instead.
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.
last reply date
Links to a later (newer) revision of this Item or Post.
later version
Links to the latest revision of this Item or Post.
latest version
A URI of a document which contains this SIOC object.
link
Links extracted from hyperlinks within a SIOC concept, e.g. Post or Site.
links to
A Usergroup that this UserAccount is a member of.
member of
A Forum that a UserAccount is a moderator of.
moderator of
When this was modified, in ISO 8601 format.
modified at
This property is deprecated. Use dcterms:modified from the Dublin Core ontology instead.
An Item that this UserAccount has modified.
modifier of
The name of a SIOC concept instance, e.g. a username for a UserAccount, group name for a Usergroup, etc.
name
Next Item or Post in a given Container sorted by date.
next by date
Links to the next revision of this Item or Post.
next version
A note associated with this resource, for example, if it has been edited by a UserAccount.
note
The number of unique authors (UserAccounts and unregistered posters) who have contributed to this Item, Thread, Post, etc.
num authors
The number of Posts (or Items) in a Forum (or a Container).
num items
The number of replies that this Item, Thread, Post, etc. has. Useful for when the reply structure is absent.
num replies
The number of Threads (AKA discussion topics) in a Forum.
num threads
The number of times this Item, Thread, UserAccount profile, etc. has been viewed.
num views
A resource owned by a particular UserAccount, for example, a weblog or image gallery.
owner of
A child Container or Forum that this Container or Forum is a parent of.
parent of
A resource that the subject is a part of.
part of
This property is deprecated. Use dcterms:isPartOf from the Dublin Core ontology instead.
Previous Item or Post in a given Container sorted by date.
previous by date
Links to the previous revision of this Item or Post.
previous version
Links either created explicitly or extracted implicitly on the HTML level from the Post.
reference
Related Posts for this Post, perhaps determined implicitly from topics or references.
related to
Links to an Item or Post which this Item or Post is a reply to.
reply of
A Role that has a scope of this resource.
scope of
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).
sibling
A resource which belongs to this data Space.
space of
Keyword(s) describing subject of the Post.
subject
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.
A Container that a UserAccount is subscribed to.
subscriber of
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.
title
This property is deprecated. Use dcterms:title from the Dublin Core ontology instead.
A topic of interest, linking to the appropriate URI, e.g. in the Open Directory Project or of a SKOS category.
topic
A Space that the Usergroup has access to.
usergroup of