Erfurt is PHP5 / Zend based Semantic Web API for Social Semantic Software.
storage abstraction layer to access third party RDF stores as well as its own Zend DB based RDF store
two different interfaces for the storage abstraction: Zend DB and Virtuoso
Erfurt RDF Store:
SPARQL to SQL rewriter and a corrsponding relational table layout
based on analysing the graph patterns of cached SPARQL queries in order to obtain information which updates will change the query result
Access Control, Versioning, SPARQL Query & Update, Plugins & Trigger, Datagathering & Data Wrapper