I am following the SPIN Getting started tutorial on TBC ME. I am trying to
add this constraint
# an invoice with no paidDate is > 90 days old
ASK WHERE {
?this :invoiceDate ?invoiceDate .
OPTIONAL {
?this purchases:paidDate ?paidDate .
} .
FILTER ((!bound(?paidDate)) && (spif:duration("d", ?invoiceDate,
afn:now()) > 90)) .
}
I get the warning below, though I have imported spinf.ttl
WARN [Thread-78] (E_Function.java:89) - URI
<http://spinrdf.org/spif#duration> has no registered function factory
What am I missing?
Thanks,
Monika
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