ANTLR, ANother Tool for Language Recognition, is a language tool that provides a framework for constructing recognizers, interpreters, compilers, and translators from grammatical descriptions containing actions in a variety of target languages.
ApproachâThe route or walk in to the base of a climb. AscenderâAny mechanical device that slides upward when put on a fixed rope but catches when weight is put on it, allowing a climber to use the rope to move upward or to haul gear. Used in aid climbing, mountaineering rescue and caving.
Climbers rappelling in tandem off Wilson Arch near Moab, Utah. Photograph Â© Stewart M. Green. Rappelling is a specialized climbing technique that is used to descend from mountains and cliffs by making a controlled slide down a fixed rope.The climbing rope is anchored to a cliff with artificial anchors like cams, pitons, and bolts or natural anchors like trees and boulders.appelling, while one of the most dangerous techniques used in climbing and the cause of many climbing accidents, is skill-based. Most rappelling accidents occur as a result of climber error rather than as an act of God. If you learn all the essential skills of rappelling, then youâll be safe on all your rappels.