RDF/Jena: a simple extension for XSLT/XALAN. Testing with NCBI-Gene
In a previous post, I've shown that the XALAN XSLT engine can be extended with custom function returning a DOM Document that will be used by the xslt-stylesheet. Here, I'll create an extension for XALAN getting some RDF statements from a Jena/RDF model. The RDF model will be loaded in memory but one can imagine to use a persistent model ( TDB or SDB). I'll download a record from NCBI-gene, transfo
RDF storage with a Key/Value Engine
Data are stored as an array of bytes. Keys are ordered on a bit-based order and the records are stored in a B-Tree table. Databases can be defined to store unique or duplicated keys. In BerkeleyDB, a Cursor is an iterator used to scan the database: as the keys are sorted , accessing a range of keys is very fast. Some indexes (Secondary Database) can be linked to a Database, for example, in the pre
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Freebase and Biohackathon 2010
Mapping RDBMS to RDF with D2RQ (yet another geeky title)
