(also asked at http://answers.semanticweb.com/questions/15915/comparing-xsddate-and-xsddatetime)
AFAICT from the specs, xsd:date and xsd:dateTimes are not comparable but consider this SPARQL 1.1 query which binds a bunch of dates and dateTimes (with and without timezones) and then compares them for equality and inequality. prefix xsd: <http://www.w3.org/2001/XMLSchema#> prefix aaa: <http://example.com:80/#> select ?dtzdtz ?dtzdt ?dtzdz ?dtzd ?ndtzdtz ?ndtzdt ?ndtzdz ?ndtzd?dtzZdt ?ndtzZdt { bind('1999-05-31T13:20:00-05:00'^^xsd:dateTime as ?dtz1) bind('1999-05-31T13:20:00Z'^^xsd:dateTime as ?dtz1z) bind('2000-05-31T13:20:00-05:00'^^xsd:dateTime as ?dtz2) bind('2001-05-31T13:20:00-05:00'^^xsd:dateTime as ?dtz3) bind('1999-05-31T13:20:00'^^xsd:dateTime as ?dt1) bind('2000-05-31T13:20:00'^^xsd:dateTime as ?dt2) bind('2001-05-31T13:20:00'^^xsd:dateTime as ?dt3) bind('1999-05-31-05:00'^^xsd:date as ?dz1) bind('2000-05-31-05:00'^^xsd:date as ?dz2) bind('2001-05-31-05:00'^^xsd:date as ?dz3) bind('1999-05-31'^^xsd:date as ?d1) bind('2000-05-31'^^xsd:date as ?d2) bind('2001-05-31'^^xsd:date as ?d3) bind(?dtz1 = ?dtz2 as ?dtzdtz) bind(?dtz1 = ?dt1 as ?dtzdt) bind(?dtz1 = ?dz1 as ?dtzdt) bind(?dtz1 = ?d1 as ?dtzdt) bind(?dtz1 != ?dtz2 as ?ndtzdtz) bind(?dtz1 != ?dt1 as ?ndtzdt) bind(?dtz1 != ?dz1 as ?ndtzdz) bind(?dtz1 != ?d1 as ?ndtzd) bind(?dtz1z = ?dt1 as ?dtzZdt) bind(?dtz1z != ?dt1 as ?ndtzZdt) } In ARQ 2.8.8, this results in #---------------------------------------------------------------------------------------- #| dtzdtz | dtzdt | dtzdz | dtzd | ndtzdtz | ndtzdt | ndtzdz | ndtzd | dtzZdt | ndtzZdt | #======================================================================================== #| false | false | | | true | | true | true | | | #---------------------------------------------------------------------------------------- which indicates that ARQ thinks I can compare a zoned dateTime with an unzoned dateTime for equality but not for inequality which seems inconsistent. Is there a way to think about this that doesn't cause my head to explode! :-) thanks, -- Gary Warren King, metabang.com Cell: (413) 559 8738 Fax: (206) 338-4052 gwkkwg on Skype * garethsan on AIM * gwking on twitter
