I ran across Virtuoso while running down the references in the article on SIREn. (Yes, I check references, not all of them, just the most interesting ones, as time permits.)
Has partial support for a variety of “Semantic Web” technologies.
Is the basis for OpenLink Data Spaces.
A named structured data cluster within a distributed data network where each item of data (each “datum”) has a unique identifier. Fundamental characteristics of data spaces include:
- Each Data Item (or Entity) is endowed with a unique HTTP-based Identifier
- Entity Identity, Access, and Representation are each distinct from the others
- Entities are interlinked via attributes and relationship properties
- Creation, Update, and Deletion privileges are controlled by the space owner
I can think of lots of “data spaces,” Large Hadron Collider data, radio and optical astronomy data dumps, TCP/IP data streams, bioinformatics data, commercial transaction databases that don’t fit this description. Please submit your own.
Still, if you want to learn the ins and outs as well as the limitations of this approach, it costs nothing more than the time to download the software.