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Various RS objects can be linked into free text (annotation text or forum post). The user can paste any Data Basket item using the editor toolbar, and we want to track all Item Types except:

  • Forum: forum post linking is handled by jForum
  • Image: We currently don't have a display of image alone
  • Text Snippet which: pasted itself, has no URI
  • Web Link: represented as a normal URL in the text, doesn't need to be tracked
  • Search: doesn't need to be tracked

Use Case

In the first tab of a Museum Object (Object Details), we want to show all related annotations and forum posts. Related annotations/posts for an object are the ones that mention it, or one of its fields

Link Types

Links are represented in text like this:

CSS Class Item Type Sample URL Note
linkMO rso:FC70_Thing Museum Object
linkStatement rdf:Statement Annotation Point
linkDataAnnotation rso:DataAnnotation Data Annotaton
linkImageAnnotation rso:ImageAnnotation Image Annotation

Linked Object

An annotation/post Links to an object ?obj iff: there is an ?uri in the free-text such that:

Link to Conditions Notes
object itself ?uri a rso:FC70_Thing. ?uri=?obj
annotation point ?uri a rdf:Statement; dcterms:isPartOf ?obj See Open Annotation Collaboration (OAC)#Annotation with OAC and Reification
data annotation {?uri a rso:DataAnnotation; oac:hasTarget ?obj} UNION
{?uri a rso:DataAnnotation; oac:hasTarget ?st. ?st a rdf:Statement; dcterms:isPartOf ?obj}
See same

Link Data Model

Since Links are pasted from the Data Basket, they are similar to the Bookmark Data Model

Property Notes
rdf:type rso:Link (new class)
oac:hasBody rso:DataAnnotation or rso:ImageAnnotation or rso:Forum
  • For annotation: the free text linking the object is in in oac:hasBody/oac:hasBody/rso:P3_has_description.
  • For forum post: they are stored in jForum, not OWLIM. We generate URIs like (where 123 is the forum ID), and mark the URI with rso:Forum (new class)
oac:hasTarget rso:FC70_Thing matching one of the conditions in Linked Object

Link Data Example

Here is a comprehensive example involving 3 links:

  1. Data annotation <object/123/annot/23> mentions <object/456>
  2. Forum post 321 mentions data annotation <object/456/annot/45> of <object/456>
  3. Image annotation <pic.tif/annot/67> mentions annotation point <st/56> of <object/456>
<link/1> a rso:Link;
  oac:hasBody <object/123/annot/23>;
  oac:hasTarget <object/456>.

<forum/123> a rso:Forum;
<link/2> a rso:Link;
  oac:hasBody <forum/123>;
  oac:hasTarget <object/456>.

<link/3> a rso:Link;
  oac:hasBody <pic.tif/annot/67/body>;
  oac:hasTarget <object/456>.

All these statements (including "a rso:Forum") need to be created

Link Data Illustration

The figure above shows the same example, plus the extra statements that make the link to <object/456>.

Link API

Extract Links

  • The annotation/forum text should be parsed to find all links (see patterns in Link Types)
  • Each link is processed to find the linked object rso:root (see conditions in Definition of Link)
  • If the link in text point to an Annotation Point (that is, it is "linkStatement"), then we need to load the rdf:Statement and get the object it is part of.

Update Links

To implement this below for posts, we need to hook into the jForum API for create/update/delete.

  • On create of annotation or post: extract and store the links.
    Do this after the annotation/post is saved, so that we have the new annotation's URI
  • On edit of annotation body or post: reparse and recreate the Links for that annotation/post
    I.e. delete any existing links, extract and store new links
  • On delete of annotation/post: delete the corresponding links

Links are stored using a method in the DMS2RDF class.

Retrieve Links

There will be 2 methods in DMS2RDF:

Jana, don't you also need to list the data annotations of the object, even if they don't mention the object?
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