In this post I'll show how I've implemented a custom function in ARQ, the SPARQL/Jena engine for querying a RDF graph. The new function implemented tests if a node in the NCBI-taxonomy hierarchy as a given ancestor.RequirementsJena/ARQ: http://jena.sourceforge.net/ARQ/A java 1.6 compilernodes.dmp , the ncbi taxonomy downloaded from ftp://ftp.ncbi.nih.gov/pub/taxonomy/Here are a sample of the very ... Continue reading