Hopefully the last installment on this thread. Holger reminded me
that I should look closer at the Help files to discover that
spl:isUntypedLiteral is a SPIN function implemented in SPARQL.
Therefore, you can find untyped literals in SPARQL alone:
ASK WHERE {
FILTER (isLiteral(?arg1) && (!sameTerm(?arg1, xsd:string(?
arg1)))) .
}
...and this is how spl:isUntypedLiteral is implemented. Thanks
Holger!
-- Scott
On Jan 4, 12:16 pm, Scott Henninger <[email protected]>
wrote:
> Paul; Note that using SPARQL it's not possible to distinguish between
> untyped literals and xsd:string literals. The TBS SPARQL Function
> spl:isUntypedLiteral checks whether a given literal is untyped and can
> be used to test for whether a string is untyped or not.
>
> -- Scott
>
> On Jan 4, 9:40 am, Scott Henninger <[email protected]> wrote:
>
> > Paul; Returning xsd:string for a "simple literal" is part of the
> > SPARQL standard for datatype().
> > Seehttp://www.w3.org/TR/rdf-sparql-query/#func-datatype
>
> > Also note that your two values for "Hasselt" are seen as equivalent by
> > SPARQL expressions. I.e.:
> > FILTER (?city = "Hasselt"^^xsd:string)
> > ...or
> > FILTER (?city = "Hasselt")
>
> > ...will match both values. The latter of the two is interesting, as
> > it show that untyped ("simple") literals are always returned as a
> > xsd:string.
>
> > -- Scott
>
> > On Jan 4, 8:19 am, PaulZH <[email protected]> wrote:
>
> > > Having for a lot of subjects for a certain property 2 values
>
> > > <x> pcce:city "Hasselt"
> > > <x> pcce:city "Hasselt"^^xsd:string
>
> > > One indicated in the TBC interface as untyped literal, the other as an
> > > xsd:string.
>
> > > I thought I could use a filter
> > > ?a pcce:city ?city.
> > > FILTER (datatype(?city) = xsd:string)
> > > But this doesn't seem to make the distinction between the two.
>
> > > And indeed, when I use
> > > LET (?type := datatype (?city)) all types appear as xsd:string.
>
> > > The range of property pcce:city has not been set.
>
> > > Any input on what I'm missing.
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