Traversing and transforming abstract syntax trees that involve name binding is notoriously difficult to do in a correct, concise, modular, customizable manner. We address this problem in the setting of OCaml, a functional programming language equipped with powerful object-oriented features. We use visitor classes as partial, composable descriptions of the operations that we wish to perform on a...

this is a year field study to evaluate the recreational needs of visitors bamu national park. bamu national park has the potential ecotourism capabilities to attract ecotourist which should be utilizing of this ability in regional planning. in this study clawson method used that one of the most common methods of evaluation systems resorts in aware of the people comments. about 225 questionnaire...

visitor management is considered important for the sustainable development of protected areas as the presence of visitors may cause negative impacts on wildlife and vegetation. within this framework, visitor impacts and perceptions are considered critical for decision-making and planning of future management regimes. this paper resumes opinions of visitors of the valley of butterflies in rhode...

Traversing and transforming abstract syntax trees that involve name binding is notoriously di cult to do in a correct, concise, modular, customizable manner. We address this problem in the setting of OCaml, a functional programming language equipped with powerful object-oriented features. We use visitor classes as partial, composable descriptions of the operations that we wish to perform on abs...