What is "dlv"

The DLV (DataLog with Disjunction, whereas the logical disjunction symbol V is used) system is a disjunctive logic programming system, implementing the stable model semantics under the Answer set programming paradigm. It extends the datalog language to allow the use of OR in rules. The tutorial page gives a simple example modeling some laughing when told a joke.

joke.
laugh :- joke.

The following would represent the case where a joke was not told.

laugh :- joke.

Since the value of joke is not indicated as true in the second program it is assumed to be false.

DLV may refer to:

• DataLog with Disjunction, a logic programming system, referred to as DLV
• Deutscher Leichtathletik-Verband, governing body of athletics in Germany
• 555 (number), written as DLV in Roman numerals
• Daylight Viewable LCD
• DNSSEC Lookaside Validation, see Domain Name System Security Extensions