InterDataNet Information Model

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InterDataNet Information Model

The Information Model is the graph-based data model to describe interlinked data representing a generic document model in IDN, independently from specific contexts and technologies. It defines the requirements, desirable properties, principles and structure of the document as it is seen by IDN-compliant applications and it is the starting point from which it has been derived the design of IDN architecture. Generic information modelled in IDN-IM is formalized as an aggregation of data units. Each data unit is assigned at least with a global identifier and contains generic data and metadata; at a formal level, such data unit is a node in a directed acyclic graph (DAG) [1] . The abstract data structure adopted within IDN-environment to handle generic data units is named IDN-Nodes. An IDN-document structures data units and it is composed by nodes related to each other through directed “links”. IDN-documents can be inter-linked. Two main link types are defined in the Information Model:

  • aggregation links, to express relations among nodes inside an IDN-document;
  • reference links, to express relations between distinct IDN-documents;
  • back links, to enable the mechanism of notification of IDN-nodes updates to parent-nodes (back propagation)

The different types of links foreseen in IDN-IM allows to implicitly assign specific authorizations on the resources involved in the link, in fact if two resources are connected through an aggregation link then the owner of each resources has the capability to write and read both of them instead the reference link implies only the capability to read the resource connected.

IDN Information Model
IDN Information Model.png

References

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