Contents

1. Open Annotation Data Model
2. Target Sources
3. Users
4. Bodies
5. Headlines
6. Notebooks

Open Annotation Data Model

The aim of the current wiki-page is to show that annotations and related structures defined by DASISH xsd schema can be presented in "Open Annotation Data Model". Current "Open Annotation" requirements can be found at ​http://www.openannotation.org/spec/core/.

In the current page we refer to several images which are open-annotation representations of DASISH xml examples. The reader is encouraged to consult these images while reading the text.

Target Sources

Single target sources are represented as instances of oa:SpecificResource.

Multiple target sources are represented as instances of oa:Composite. Each of oa:item of the composite is either an instance of oa:SpecificResource or oa:Composite.

Users

A user or a group of user is an agent, and for agents "Open Annotation" standart recommends to use foaf namespace, see ​http://xmlns.com/foaf/spec/. This data model is designed for social networks, and in principle suits DASISH schema for a user and permission lists. There is one little technical inconvenience: foaf agents do not have a property which can be used to define permission types (owner, reader, writer) directly. For now, permissions are represented via property foaf:topic_interest.

Bodies

An annotation body in DASISH can be any correct xml. A generic way to present such bodies in "Open Annotation" is to consider a body, which (typically) has attributes and elements, as instances of oa:Composite. Any element and any attribute of the body becomes an oa:item of the body. If an element has sub-elements, it is an instance of oa:composite as well, etc. An attribute or an element with now sub-elements has one of the dctypes and one of the dc:formtats, and possibly additional relevant properties, such as cnt:chars for text values.

Headlines

Any DASISH annotation contains a text element called headline. There is no direct way to represent such a headline in Open Annotation Data Model. In DASISH presentation it is an oa:item of a "big" body, called SuperBody which is an instance of oa:Composite. Another item of SuperBody is the actual body of the annotation.

Notebooks

Open Annotation does not define structures like "notebook" or "annotations collection", or similar. Nevertheless, a notebook can be presented as an annotation which body is title and target Annotations is an instance of oa:Composite. Any annotation in the notebook becomes an oa"item of Annotations.