Table 1: Comparison of features provided by Entrez, Bio2RDF, and NCBI2RDF for accessing the NCBI databases.

Query languageSupport for complex queriesSupport for full NCBI database structureAccess to up-to-date dataAdaptability to changes in NCBI databases

EntrezHTML formNoYesYesYes
Bio2RDFHTML formNoNoNoNo
NCBI2RDFSPARQLYesYesYesYes