Temporal Logics on Words with Multiple Data Values

The paper proposes and studies temporal logics for attributed words, that is, data words with a (finite) set of (attribute,value)-pairs at each position. It considers a basic logic which is a semantical fragment of the logic LTL1 of Demri and Lazic with operators for navigation into the future and the past. By reduction to the emptiness problem for data automata it is shown that this basic logic is decidable. Whereas the basic logic only allows navigation to positions where a fixed data value occurs, extensions are studied that also allow navigation to positions with different data values. Besides some undecidable results it is shown that the extension by a certain UNTIL-operator with an inequality target condition remains decidable. 1998 ACM Subject Classification F.4.1 [Mathematical Logic and Formal Languages]: Mathematical Logic – Temporal logic; F.4.3 [Mathematical Logic and Formal Languages]: Formal Languages – Decision problems