Places to go:

• RDF Delta
  Change format and change logs for RDF.
  High-availability Apache Jena Fuseki.

• RDF Thrift
  A binary encoding for RDF and SPARQL Result Sets.

Notes:

• RDF and IRI Syntax
  Practical notes on the details of IRIs/URIs.

• SPARQL Grouping and Aggregation with no matches
  Details of SPARQL GROUP - COUNT.

• Substitution of Variables in SPARQL
  Analysis and proposal for the process of substitution of values for variables.