Onager (their status in China is not well known). Persian onagers are currently being reintroduced in the Middle East as replacements for the extinct Syrian wild ass in the Arabian Peninsula, Israel and Jordan. The specific name is Ancient Greek ἡμίονος ("hēmíonos"), from ἡμι- (hēmi-), half, and ὄνος (ónos), donkey; thus, half-donkey or mule. In Persian the archaic word "gur" preserves the second syllable of the common Indo-European term that includes "ona"/"ono" (donkey) and "ger"/"gur" (swift). The species was commonly known as Asian wild ass, in which case the term "onager" was reserved for the "E. h. onager" subspecies, more specifically
Type system or an "effect system", which enables even more program specifications to be verified by a type checker. Beyond simple value-type pairs, a virtual "region" of code is associated with an "effect" component describing "what" is being done "with what", and enabling for example to "throw" an error report. Thus the symbolic system may be a "type and effect system", which endows it with more safety checking than type checking alone. Whether automated by the compiler or specified by a programmer, a type system makes program behavior illegal if outside the type-system rules. Advantages provided by programmer-specified type systems include: Advantages