TY - CONF A1 - Betz, Hariolf A1 - Raiser, Frank A1 - Frühwirth, Thom T1 - Persistent constraints in constraint handling rules N2 - In the most abstract definition of its operational semantics, the declarative and concurrent programming language CHR is trivially non-terminating for a significant class of programs. Common refinements of this definition, in closing the gap to real-world implementations, compromise on declarativity and/or concurrency. Building on recent work and the notion of persistent constraints, we introduce an operational semantics avoiding trivial non-termination without compromising on its essential features. Y1 - 2010 UR - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/3970 UR - https://nbn-resolving.org/urn:nbn:de:kobv:517-opus-41547 ER -