 The metacircularity of the language is the reason why, e.g., the Parse dialect used (not exclusively) for definitions and transformations of REBOL dialects is also itself a dialect of REBOL.REBOL was used as a source of inspiration for JSON.Gellish English is a formalized subset of natural English, which includes a simple grammar and a large extensible English Dictionary-Taxonomy that defines the general and domain specific terminology (terms for concepts), whereas the concepts are arranged in a subtype-supertype hierarchy (a taxonomy), which supports inheritance of knowledge and requirements.