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= 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}}}.

[[Image(source.png)]]

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}}}.

[[Image(users.png)]]

= 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:formtat}}}s, 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}}}.