RDF.XSD.Decimal.fraction_digit_count

You're seeing just the function fraction_digit_count, go back to RDF.XSD.Decimal module for more information.
Link to this function

fraction_digit_count(literal)

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Specs

fraction_digit_count(RDF.Literal.t()) :: non_neg_integer() | nil

The number of digits to the right of the decimal point in the XML Schema canonical form of the literal value.