This specification describes the vocabulary used to formalize tags (folksonomies) in
the EzWeb project.
1. Introduction
Folksonomies are heavily used in Web 2.0. The Semantic Web has provide many formalizations with
different approaches. As some of these approaches could be valid in EzWeb, it is necessary to define
the glue to adapt it for the concrete context of EzWeb. Under a normative namespace:
http://ontologies.ezweb.morfeo-project.org/eztag/ns#
using content negotiation and following the best practice recipes [RECIPES],
it can access to a human-readable specification (this document) and to a
small RDF Vocabulary with formal definition of the terms used as glue
of others popular ontologies/vocabularies for tagging.
Following figure illustates its design (instances' source can be founded both in
in EzTag's source code and in Section 3.1):
As it is described in Section 4.1 with more detail, EzTag is build on top of
Tag ontology [TAGONTOLOGY].
2. EzTag at a glance
An alphabetical index of EzTag terms, by class (concepts) and by property
(relationships, attributes), are given below. All the terms are hyperlinked
to their detailed description for quick reference.
3. EzTag overview
Actually EzTag could not be considered as a complete ontology, but as a vocabulary as glue of others semantic tagging proposals.
Its main purpose is to represent the annotations of resources made by EzWeb's users.
3.1. Example
Here is a very basic example describing how EzTag can be used:
<ezt:Annotation rdf:about="http://example.org/annotations/1">
<tag:associatedTag>
<ezt:Tag rdf:about="http://example.org/tags/python">
<rdfs:label>python</rdfs:label>
</ezt:Tag>
</tag:associatedTag>
<tag:taggedBy rdf:resource="http://example.org/users/23" />
<tag:taggedResource rdf:resource="http://dbpedia.org/resource/Django_(web_framework)" />
</ezt:Annotation>
4. Cross-reference for EzTag classes and properties
4.1 External classes and properties
As EzTag is build on top of Tag ontology [TAGONTOLOGY], it reuses some classes
and properties from that ontology. The example illustrates in a simple way how EzTag uses theses
properties:
A References
- MOAT
-
Alexandre Passant, MOAT, Meaning of a Tag, 2008
- OWL
-
Peter F. Patel-Schneider, Patrick Hayes, and Ian Horrocks,
OWL Web Ontology Language Semantics and
Abstract Syntax, W3C Recommendation, February 2004,
- RECIPES
-
Diego Berrueta and Jon Phipps, Best Practice
Recipes for Publishing RDF Vocabularies, W3C Working Group Note, August 2008.
- RDFS
-
Dan Brickley and R. V. Guha, RDF
Vocabulary Description Language 1.0: RDF Schema, W3C Recommendation, February 2004.
- RFC2119
-
S. Bradner, RFC 2119:
Key words for use in RFCs to Indicate Requirement Levels. Internet
Engineering Task Force, 1997.
- RFC2396
-
T. Berners-Lee et al., RFC 2396:
Uniform Resource Identifiers (URI): Generic Syntax. Internet
Engineering Task Force, 1998.
- TAGONTOLOGY
-
Richard Newman, Tag ontology, 2005.
- SKOS
-
Alistair Miles and Dan Brickley,
SKOS Core Vocabulary Specification
W3C Working Draft, November 2005.
B Changes in this version
- 05/12/2008: first public version of the specification
- 27/11/2008: initial version of the vocabulary
C Acknowledgements
This document was produced with the participation of the
EzWeb project
consortium (by alphabetic order):
This specification has been generated using SpecGen.
Copyright © 2008 by Fundación CTIC. This work
is licensed under CreativeCommons
Attribution-Share Alike 3.0, so you are granted to use, copy, distribute, transmit and adapt
this work, but you must attribute the work to the original authors and distribute the resulting
work under similar terms.
