- From: Andy Seaborne <andy@apache.org>
- Date: Wed, 31 Jul 2013 10:06:13 +0100
- To: public-rdf-dawg-comments@w3.org
On 30/07/13 15:05, Jerven Bolleman wrote: ... > The second is an expansion of the basic math operators to include at > least (square)root. (square)root is very hard to implement using the > current SPARQL constructs yet is a very useful function. (even if not > exact) The SPARQL 1.1 library was decided mainly by taking the non-sequence related functions from XQuery/XPath Functions and Operators (F&O), sorting out a few details of RDF/SPARQL evaluation, and adding some SPARQL specific functions (e.g. STRDT). F&O is an excellent resource because it defines exactly what all the operations do. It is (oddly?) lacking on numeric operations like sqrt and similar but there may be a good reason for that. I agree it would be good to have sqrt. Let's hope that implementations add it as an URI-callable function. If we implementers decide on the URI, then queries will be portable. http://www.w3.org/ns/sparql is supposed to be populated with URIs for every function with a keyword in SPARQL. That action (389) got lost. So ... prefix http://www.w3.org/ns/sparql# sfn:sqrt(numeric) -> double. What else (within reason!)? Andy
Received on Wednesday, 31 July 2013 09:06:44 UTC