Software development, and in particular open source software development, relies on an increasing number of support tools (Dabbish et al., 2012;Storey et al., 2010;Lanubile et al., 2010). Each of them maintain **data** about the software development process, the Extra functionality. Built-in functionality for addressing common problems in realworld **data** retrieval, storage and analysis: fault-tolerance, incremental retrieval, extensibility, facilities for **data** curation, identity management (including tracking of identities in different **data** sources), **data** persistence, traceability and uniform access to the data.