Virtuoso 6.2 introduces a major number of enhancements to areas including...

  • Linked Data Deployment
  • Linked Data Middleware
  • Data Virtualization
  • Dynamic Data Exchange & Data Replication
  • Security

Linked Data Deployment

Feature Description Benefit
Automatic Deployment Linked Data Pages are now automatically published for every Virtuoso Data Object; users need only load their data into the RDF Quad Store. Handcrafted URL-Rewrite Rules are no longer necessary.
HTTP Metadata Enhancements HTTP Link: header is used to transfer vital metadata (e.g., relationships between a Descriptor Resource and its Subject) from HTTP Servers to User Agents. Enables HTTP-oriented tools to work with such relationships and other metadata.
HTML Metadata Embedding HTML resource <head /> and <link /> elements and their @rel attributes are used to transfer vital metadata (e.g., relationships between a Descriptor Resource and its Subject) from HTTP Servers to User Agents. Enables HTML-oriented tools to work with such relationships and other metadata.
Hammer Stack Auto-Discovery Patterns HTML resource <head /> section and <link /> elements, the HTTP Link: header, and XRD-based "host-meta" resources collectively provide structured metadata about Virtuoso hosts, associated Linked Data Spaces, and specific Data Items (Entities). Enables humans and machines to easily distinguish between Descriptor Resources and their Subjects, irrespective of URI scheme.

Linked Data Middleware

Feature Description Benefit
New Sponger Cartridges New cartridges (data access and transformation drivers) for Twitter, Facebook, Amazon, eBay, LinkedIn, and others. Enable users and user agents to deal with the Sponged data spaces as though they were named graphs in a quad store, or tables in an RDBMS.
New Descriptor Pages HTML-based descriptor pages are automatically generated. Descriptor subjects, and the constellation of navigable attribute-and-value pairs that constitute their descriptive representation, are clearly identified.
Automatic Subject Identifier Generation De-referenceable data object identifiers are automatically created. Removes tedium and risk of error associated with nuance-laced manual construction of identifiers.
Support for OData, JSON, RDFa Additional data representation and serialization formats associated with Linked Data. Increases flexibility and interoperability.

Data Virtualization

Feature Description Benefit
Materialized RDF Views RDF Views over ODBC/JDBC Data Sources can now (optionally) keep the Quad Store in sync with the RDBMS data source. Enables high-performance Faceted Browsing while remaining sensitive to changes in the RDBMS data sources.
CSV-to-RDF Transformation Wizard-based generation of RDF Linked Data from CSV files. Speeds deployment of data which may only exist in CSV form as Linked Data.
Transparent Data Access Binding SPASQL (SPARQL Query Language integrated into SQL) is usable over ODBC, JDBC, ADO.NET, OLEDB, or XMLA connections. Enables Desktop Productivity Tools to transparently work with any blend of RDBMS and RDF data sources.

Dynamic Data Exchange & Data Replication

Feature Description Benefit
Quad Store to Quad Store Replication High-fidelity graph-data replication between one or more database instances. Enables a wide variety of deployment topologies.
Delta Engine Automated generation of deltas at the named-graph-level, matches transactional replication offered by the Virtuoso SQL engine. Brings RDF replication on par with SQL replication.
PubSubHubbub Support Deep integration within Quad Store as an optional mechanism for shipping deltas. Enables push-based data replication across a variety of topologies.


Feature Description Benefit
WebID support at the DBMS core Use WebID protocol for low-level ACL-based protection of database objects (RDF or Relational) and Web Services. Enables application of sophisticated security and data access policies to Web Services (e.g., SPARQL endpoint) and actual DBMS objects.
Webfinger Supports using mailto: and acct: URIs in the context of WebID and other mechanisms, when domain holders have published necessary XRDS resources. Enables more intuitive identification of people and organizations.
Fingerpoint Similar to Webfinger but does not require XRDS resources; instea,d it works directly with SPARQL endpoints exposed using auto-discovery patterns in the <head /> section of HTML documents. Enables more intuitive identification of people and organizations.