Annotea, A Standard for e-Comments Simonet Alexandre Exchange Student Media Engineering Annotations...

Annotea, A Standard for e-Comments

Simonet AlexandreExchange StudentMedia Engineering

Annotations

Definition

Metadata

Annotea

Infrastructure ; RDF, Xpointer, Xlink

Annotea annotation model

Amaya

Description

Practice

Discussion & conclusion

1Annotation ConclusionAmayaContents Annotea


Annotations are comments, notes, explanations, or other types of external remarks that can be attached to a Web document or a selected part of the document .

Annotations give additional information about an existing piece of data = metadata.

An annotation has many properties including : • Physical location : is the annotation stored in a local file system

or in an annotation server.

• Scope : is the annotation associated to a whole document or just to a fragment of this document .

• Annotation type : the kind of annotation you can expect ; for example, Comment or Query.


Metadata, or literally "data about data,"

For improving the quality of web search.

The folks at the W3C, the closest thing the web has to a standards committee, have released Annotea, an open source "annotation" capability that lets anyone create metadata about web pages that is stored on separate "annotation servers."


Annotea, a new technology that lets you annotate existing Web documents with commentary of your own.

It is part of the W3C's Semantic Web project.

Annotea sees annotations as metadata about a whole document or a part of a document.

Annotea is basically an annotation server : it uses an RDF database and a simple HTTP front end to store annotations, and respond to annotation queries.XPointer is used for locating the annotations in the annotated document.


XLL, the extensible linking language , is a new means of linking between documents.

XLL is devided into two parts : Xlink and Xpointer.

Xpointer is used for locating the annotations in the annotated document.

Xlink, the xml linking language, defines how one document links to another document.

Xpointer, the xml pointer language, defines how individual parts of a document are addressed.

Xpointer refers to particular parts of a locations in XML document. A means of Addressing specific locations and ranges in XML documents; used inside Xlink.


Resource Description Framework (RDF), as its name implies, is a framework for describing and interchanging metadata.

Main Principles of RDF : • foundation for metadata processing. • used to describe internet resources and how they relate to each other. • provides interoperability between applications that exchange information on the Web. • uses XML to exchange descriptions of Web resources • flexible enough that the application that it describes can be either XML and non-XML resources.


The basic architecture of Annotea


The Annotea annotation model :

The annotates property refers to the annotated document.The context property refers to the actual place of the annotation within the document.The body property contains the content of the annotation.The dc:title property is a descriptive annotation title.


There are the clients for annotea :

• Amaya. Provides a native support for Annotea, for both publishing, querying, and discussion threads.

• Annozilla Uses Annotea within Mozilla.

• SnufkinUses Annotea with IE.

Annotation isn't new, and there have been several attempts to add it to the Web so far.

Annotea takes a slightly different approach, being non-proprietary and based on open web standards.


The first client implementation of Annotea is W3C's Amaya editor/browser.

Currently Amaya presents annotations with pencil annotation icons ( )

Annotations can be stored locally or in one or more annotation servers. When a document is browsed, Amaya queries each of these servers, requesting the annotations related to that document.


Practice with Amaya :

Creating an Annotation

Annotation Metadata

Saving an Annotation

About Local Annotations

Configuring Annotation Settings

Navigating Annotations

Annotations in the Link window

The Annotation Local Filter Menu


Advantages :

• Creating annotations for a Web document does not modify the source document itself. That is, the source document is not changed in any way.

• The basic concepts of learning in the future.

• Share the annotations on the web.

Disadvantages :

• That it is currently not very practical to use annotations directly in a lecture; It is too time consuming !

• Today, not everybody has a compatible browser.


Have you got some questions ?

Sources :

• XML, Extensible Markup Language from Elliotte Rusty Harold,• Annotations in Amaya, help from Amaya Browser,

• www.w3c.org• http://www.w3.org/Amaya• http://www.w3.org/XML/Linking• http://www.prometeus.org/• http://www.xml.com/index.csp• http://www.mozilla.org/• http://searchenginewatch.com/

Thanks !

http://www.w3c.org/

http://www.w3.org/Amaya

http://www.w3.org/XML/Linking

http://www.prometeus.org/

http://www.xml.com/index.csp

http://www.mozilla.org/

http://searchenginewatch.com/

Annotea, A Standard for e-Comments Simonet Alexandre Exchange Student Media Engineering Annotations...

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