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rdf_literal_value/2 treats decimal numbers as floats #6

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wouterbeek opened this issue Aug 1, 2015 · 0 comments

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bug

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wouterbeek commented Aug 1, 2015

rdf_literal_value/2 treats decimal numbers as floats:

?- rdf_literal_value(literal(type(xsd:decimal,'0.99999999999999999')), X).
X = 1.0.

Prolog supports rationals that can accurately represent decimal numbers, as used by plXsd:

?- xsd_lexical_map(xsd:float, '0.3333333333333333', X), Y is X * 3.
X = 0.3333333333333333,
Y = 1.0.

?- xsd_lexical_map(xsd:decimal, '0.3333333333333333', X), Y is X * 3.
X = 3333333333333333 rdiv 10000000000000000,
Y = 9999999999999999 rdiv 10000000000000000.

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RDF literal representation SWI-Prolog/roadmap#11

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