Question

Apologies if this has been asked before but it seems an obvious question for which I can’t seem to get a working solution. I’ve loaded some data into Fuseki which contains statements comprising xsd:date information. I have written a query to extract these dates and I would like to find the duration (in days) between two specific date. A cut down query is shown below.

PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
PREFIX abc: <http://www.acme.com/ABC/1.0/abc-schema#>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>

SELECT ?entry
(date1 - date2) AS ?interval)
WHERE
{
    # Not the real query but you get the idea
    ?entry a abc:thing ;
        abc:abcDateType1 ?date1 ;
        abc:abcDateType2 ?date2 .
} 

?interval is calculated correctly and seems to be in the form of an xsd:duration data type, my question is how do I extract the number of days it contains? Alternatively is there a better (standard) way of doing this.

Thank you for reading.

Answer 1

You will need to work with the lexical for of the XSD duration. It is likely to be for the form “PD….”

The answer should be call fn:days-from-duration, or a keyword for that function, but that isn’t in the standard distribution at the moment.