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Data

VIVO has four data stores. When copying, backing up, or restoring a VIVO installation, all four data stores should be considered.

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VIVO adds a layer of "business logic" to the data storage. It uses inference to add to the data. It applies policies to determine which users are authorized to see which pieces of data.

Controllers and Editing Framework

The controllers contain the top-level logic, determining how to respond to web requests. This includes fetching data, making decisions based on that data, and displaying the results.

The Editing Framework provides the user with the tools needed to edit the RDF data. In some cases, a simple default screen will suffice. For more elaborate data structures, the Editing Framework creates related groups of data objects, and enforces the relationships among them.

DAOs

The DAOs, or Data Access Objects, form a layer of secondary logic. They provide a large number of utility subroutines, to take the repetitive processing tasks away from the Controllers and Editing Framework.

The DAOs also provide a framework for the filtering layer.

Filtering

Data within VIVO can be public or private, or shades of gray. The Filtering layer works with the Authentication system to determine which pieces of data may be displayed to a particular user. 

The Filtering layer means that the Controllers don't need to include logic for this sort of decision. The Controller asks the Filtered DAOs for data, and receive all that data that the current user is authorized to see.

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