YAP includes several external packages that work with YAP. Our very sincere thanks to the authors for allowing the inclusion of these packages. The packages are:
CHR, developed by Thom Fruewirth and Christian Holzbaur;
clp(Q,R), developed by Christian Holzbaur;
Pillow 1.1 developed by the ciao group at UPM.
The CLP(BN) package is being developed at UFRJ and will soon be included in YAP.