Sunday 30 August 2009

The SPARQL Tutorial

Today's update (30 August 2009) includes a version of the ARQ SPARQL Tutorial and some associated fixes to the SPARQL subsystem. Specifically, default data sets should work better for the RDF application program.

Saturday 22 August 2009

Better Numeric Types

Today's update (22 August) fixes a number of bugs mostly related to handling of numeric types. Two corrections to the syntax checking fix the BETWEEN predicate and named columns joins.
I really do like finding and fixing bugs!

Friday 14 August 2009

Subtype improvements

Today's update to the DBMS corrects the handling of the new URI-based subtypes of standard types. As mentioned in previous posts, these are a novelty in Pyrrho, allowing declarations such as
create type uk_numberplate as char with ''
As of today's version the representation clause ("as char" in this example) for such types is constrained to be a standard type. Subtypes of such types must be declared as follows:
create type sc_nunberplate under uk_numberplate as char with ''
The semantic of IS OF for these subtypes has been corrected.