Hello Christian and RŠ°jeev,
It is technically possible to enable xsd:float and check if it works
really good at startup on given OS/compiler/runtime and dump a warning
to the server log. I'll try and if it works for some of my boxes then
I'll put it to next VOS release (that is expected soon).
Best Regards,
Ivan Mikhailov.
On Sun, 2008-01-20 at 12:39 +0100, Christian Becker wrote:
> Hi Ivan,
> I see that xsd:floats are not returned for SPARQL queries, either.
> Note that one can't always choose another datatype - for DBpedia 3.0
> we just changed all geocoordinates to xsd:float to match the related
> ontology.
> I'd just like to cast my vote for xsd:float support - apart from the
> fact that it is a popular datatype, there's a ton of cool stuff to be
> done with DBpedia's geocoordinates that I would love to see working
> again on the public SPARQL endpoint.
>
> Thanks,
>
> Christian
>
> On Jan 19, 2008, at 10:20 PM, Ivan Mikhailov wrote:
>
> > Hello Rajeev,
> >
> > The strongly advised workaround is to use xsd:doublePrecision
> > instead of
> > xsd:float. The problem with float is that it is not enough precise.
> > Depending on hardware platform and C library used by compiler same
> > literal can be parsed and then printed as, say, "4.1299999999" or
> > "4.13", sooner or later it results in weird errors. Say, one see
> > "4.1299999999" in the output and tries to delete it from graph and the
> > request deletes nothing. The issue was so annoying that we suspended
> > this support temporarily. Probably it will be fixed by converting all
> > xsd:floats into xsd:doublePrecision literals; but that will raise some
> > other error -- unexpected return values of DATATYPE() SPARQL built-in
> > function.
> >
> > Best Regards,
> > Ivan Mikhailov
> > OpenLink Software.
> >
> > On Sat, 2008-01-19 at 05:51 +0530, Rajeev J Sebastian wrote:
> >> Hello all,
> >>
> >> I am running Virtuoso Version 05.00.3023-pthreads.
> >>
> >> When running a sparul something like:
> >>
> >> insert {
> >> <foo:xyz> <foo:left>
> >> "21.0396039604"^^<http://www.w3.org/2001/XMLSchema#float
> >> >.
> >> }
> >>
> >> I get an error, "37000 Error SP031: SPARQL compiler: Current
> >> implementation of SPARQL does not supports literals of type REAL"
> >>
> >> How can I workaround this error ?
> >>
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