While developing some SPIN rules, I have encountered a problem, I don't
know how to solve. I'm very new to ontologies, SPARQL and SPIN and my last
thread was answered very quickly and I'm so thankful for that. So I'll try
it again with this problem.
I have the following code that should set a DateTime as soon as a threshold
is reached or surpassed. However, I encounter an infinite loop when using
sp:now(). I have tried it with different methods, including just setting a
'date' manually (e.g. 2/2/2014), which works just fine.
*CONSTRUCT* {
?EW ns:WEInitiation ?EWI .
?EW ns:WEHasDateTime ?EWDT .
}
*WHERE* {
*?this* ns:FRHasWEThresholdLevel ?EWTL .
*?this* ns:FRHasWEScoreLevel ?EWSL .
*?this* ns:FRInitiatesWE ?EW .
*BIND* (*IF*((?EWSL >= ?EWTL), true, false) *AS* ?EWI) .
*BIND* (*IF*((?EWSL >= ?EWTL), sp:now(), "") *AS* ?EWDT) .
<https://groups.google.com/forum/#_msocom_1>
Can you please help me figure out what the problem is? Is it the mechanics
of SPIN rules that won't work here? I assumed that the problem was, that
sp:now takes the time as it is now, and again, and again, since 'now' is
relative. But after reading the description it says that 'now' is when the
query was started.
Thanks in advance.
K. J.
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