[Pellet-users] SWRL substring built-in error

[Alan Meech]

I am writing SWRL rules in Pellet 2.0.0 RC 5 with various built-in 
functions.  When I run a rule with the swrlb:substring, I get the 
following error.  Can anyone tell me what it means?  Many thanks.

Jul 16, 2009 11:52:10 PM com.clarkparsia.pellet.rules.UsableRuleFilter 
isUsable
WARNING: Ignoring rule [substring(["abc"^^string, "arabca"^^string, 
"0"^^integer, "3"^^integer])] => [Result3(test3a)]:No builtin for 
http://www.w3.org/2003/11/swrlb#substring
Jul 16, 2009 11:52:10 PM com.clarkparsia.pellet.rules.UsableRuleFilter 
isUsable
WARNING: Ignoring rule [substring(["abc"^^string, "arabca"^^string, 
"2"^^int, "3"^^int])] => [Result3(test3b)]:No builtin for 
http://www.w3.org/2003/11/swrlb#substring