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OpenLink-supplied Virtuoso Sponger Cartridges

There are a few kinds of Cartridge, and many of each kind are included in a standard Virtuoso installation.

Extractor Cartridges

An Extractor Cartridge processes a Resource of a given format, extracting RDF according to rules appropriate to that format. External data does not come into play; only the content of the Resource fed to the Sponger.

Supported Standard Non-RDF Data Formats

These Cartridges handle open formats — typically community-developed, openly-documented, and freely-licensed data structures.

Supported Vendor-specific Non-RDF Data Formats

These Cartridges handle closed formats — typically proprietary; sometimes undocumented; possibly licensed to no-one except the format originator. Sometimes data may not be parsed as desired or expected, as many of these Cartridges have required reverse-engineering of the data format in question.

Meta Cartridges

A Meta Cartridge submits a Resource to a third-party Web Service for processing. Returned RDF supplements the RDF generated by Extractor and other Meta Cartridges. Locally generated RDF may also be submitted to the third-party services, instead-of or in-addition-to the original Resource itself.

Default Sponger behavior is for all installed Meta Cartridges to be brought to bear on all submitted Resources.

Sponger Cartridge based Dynamic Linked Data Cloud

Click the image for a full-size, clickable version!

Sponger Cloud PNG

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