- From: Dan Connolly <connolly@w3.org>
- Date: Mon, 21 Mar 2005 10:53:29 -0600
- To: "Seaborne, Andy" <andy.seaborne@hp.com>
- Cc: RDF Data Access Working Group <public-rdf-dawg@w3.org>
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. let's use technical, rather than (or in addition to) process keywords in the subject. [2nd issue to follow separately...] -- Dan Connolly, W3C http://www.w3.org/People/Connolly/ D3C2 887B 0F92 6005 C541 0875 0F91 96DE 6E52 C29E
Received on Monday, 21 March 2005 16:53:32 UTC