If specified, it states the valid characters that an identifier can end with. Only one of the items below can be included. If are different. The keywords if and IF are treated as the same identifier. The blank or noblank argument determines if blank characters can appear between the function identifier and the function start character.
Most languages use a small number of generic types of languages.
Multiple values may be specified, as many languages use both single and double quotes. Both paired and line comments can be specified, as can multiple occurrences of each. They have an opening string and a closing string. This defines the string that closes a paired comment. Some languages allow paired comments to be nested.