- From: Seaborne, Andy <andy.seaborne@hp.com>
- Date: Mon, 21 Mar 2005 17:04:45 +0000
- To: Dan Connolly <connolly@w3.org>
- CC: RDF Data Access Working Group <public-rdf-dawg@w3.org>
Dan Connolly wrote: > On Mon, 2005-03-21 at 16:04 +0000, Seaborne, Andy wrote: > >>Matters arising from the comments list: >> >> >>1/ SELECT to involve expressions >> >>SQL allows constants and expressions in explicit projections (SQL SELECT in >>other words) >> >> SELECT ?x "constant" ... >> SELECT ?x (?x+?y) ... >> >>Combined with nested SELECTs and UNIONs, we would have a way to tag which branch >>of a union a solution came from. This can already be done using different >>variables in each branch. >> >>This would require access to results by column number (or aliases which are not >>required by SQL) and so have impact on the results format. >> >>At the moment, SPARQL UNION is defined without the explicit SELECT projection >>and is a graph pattern operator. There is no no assignment of values - it's not >>possible to return RDF terms that are not in the graph or a dataset label. -1 Would need a strong use case to open at this stage. Andy > > > let's use technical, rather than (or in addition to) process keywords > in the subject. > > [2nd issue to follow separately...] >
Received on Monday, 21 March 2005 17:05:28 UTC