Hi Steve,
you can use JavaScript to define a SPARQL function that converts
milliseconds into a valid xsd:dateTime. I have attached such a function,
defined using SPINx:
msToDate:msToDate
rdf:type spin:Function ;
spin:constraint [
rdf:type spl:Argument ;
spl:predicate arg:ms ;
spl:valueType xsd:integer ;
rdfs:comment "The milliseconds as a number." ;
] ;
spin:returnType xsd:dateTime ;
spinx:javaScriptCode "return new Date(arg1).toISOString();" ;
rdfs:label "ms to date" ;
rdfs:subClassOf spin:Functions ;
.
The key here is the JS function Date.toISOString() which has AFAIK no
equivalent in our SPARQL support right now.
Use it as in
SELECT *
WHERE {
BIND (NOW() AS ?now) .
BIND (spif:timeMillis(?now) AS ?ms) .
BIND (?ms + 1000 AS ?later) .
BIND (msToDate:msToDate(?later) AS ?result)
}
Does this sound right?
Holger
On 23/02/2017 10:01, Steve Ray (CMU) wrote:
Hi,
I’m building a set of SPIN rules, and will need to be able to do
calculations on date/time values represented according to RFC 5545,
such as:
2014-12-09T12:37:40Z
I need to add a duration to such a date/time, again using the same
standard, such as:
PT30M
I dread the idea of parsing these strings, accounting for days in a
month, not to mention leap years. It would be amazing if there was a
SPIN function library for these operations. Next best I suppose, is a
Java library, although I don’t have any experience in calling external
Java routines from within a SPIN rule (but I believe it’s not hard,
right?).
Does anybody have a suggestion of how I might proceed?
- Steve
Steven R. Ray, Ph.D.
Distinguished Research Fellow
Carnegie Mellon University
NASA Research Park
Building 23 (MS 23-11)
P.O. Box 1
Moffett Field, CA 94305-0001
Email: [email protected]
Phone: (650) 587-3780
Cell: (202) 316-6481
Skype: steverayconsulting
cid:[email protected]
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# baseURI: http://example.org/msToDate
# imports: http://spinrdf.org/spinx
# prefix: msToDate
@prefix arg: <http://spinrdf.org/arg#> .
@prefix msToDate: <http://example.org/msToDate#> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix sp: <http://spinrdf.org/sp#> .
@prefix spin: <http://spinrdf.org/spin#> .
@prefix spinx: <http://spinrdf.org/spinx#> .
@prefix spl: <http://spinrdf.org/spl#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
<http://example.org/msToDate>
rdf:type owl:Ontology ;
owl:imports <http://spinrdf.org/spinx> ;
owl:versionInfo "Created with TopBraid Composer" ;
.
msToDate:msToDate
rdf:type spin:Function ;
spin:constraint [
rdf:type spl:Argument ;
spl:predicate arg:ms ;
spl:valueType xsd:integer ;
rdfs:comment "The milliseconds as a number." ;
] ;
spin:returnType xsd:dateTime ;
spinx:javaScriptCode "return new Date(arg1).toISOString();" ;
rdfs:label "ms to date" ;
rdfs:subClassOf spin:Functions ;
.
arg:ms
rdf:type rdf:Property ;
rdfs:subPropertyOf sp:arg ;
.
