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TrFrN)rryearMonthDurationrr&rWtimerK)obj1dt1obj2dt2s r1isCompatibleDateTimeDatatyperBs chh #'' ' C'' '3#,,+>c$i chh #'' ' C'' '3#,,+>c$il" cllr3cJ|}|}||z }t|tjS)z< returns the duration Literal between two datetime rx)r"rduration)rrdate1date2 differences r1rereis( E EJ : 55r3ct||||r)|dk(r||z }t||S||z}t||Std)z Calculates the final dateTime/date/time resultant after addition/ subtraction of duration/dayTimeDuration/yearMonthDuration rrxz.Incompatible Data types to DateTime Operations)rr"r)rrrr operationanss r1rfrfxsT$D#tS9  +C3- -+C3- -JKKr3cyr5r7rts r1rGrGs!r3cyr5r7rs r1rGrGsMPr3cyr5r7rs r1rGrGsLOr3cxt|tr|jtjk(r|j S|jtj k(s |jt|dkDS|j }t|trtd|zt|Std|z)a Effective Boolean Value (EBV) * If the argument is a typed literal with a datatype of xsd:boolean, the EBV is the value of that argument. * If the argument is a plain literal or a typed literal with a datatype of xsd:string, the EBV is false if the operand value has zero length; otherwise the EBV is true. * If the argument is a numeric type or a typed literal with a datatype derived from a numeric type, the EBV is false if the operand value is NaN or is numerically equal to zero; otherwise the EBV is true. * All other arguments, including unbound arguments, produce a type error. rzjhttp://www.w3.org/TR/rdf-sparql-query/#ebv - ' + 'Could not determine the EBV for : %rzchttp://www.w3.org/TR/rdf-sparql-query/#ebv - ' + 'Only literals have Boolean values! %r) r*r"ryrrOrr\rrr)rpyRTs r1rGrGs "g ;;#++ %;;= [[CJJ &"++*=r7Q; ;;=D$(%; Dz! 4   r3cLdd|jjjd}|jjjd}|d|dsyt|t|kDryt fdt ||DS)a( Implementation of the extended filtering algorithm, as defined in point 3.3.2, of U{RFC 4647}, on matching language ranges and language tags. 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