Returns #t if v is a string that is syntactically valid as a collection name, which means that it is one or more /-separated strings for which collection-name-element? returns true.

Returns #t if v is a string that is syntactically valid as a top-level collection name or as a part of a collection name, which means that it is non-empty and contains only ASCII letters, ASCII digits, -, +, _, and %, where a % is allowed only when followed by two lowercase hexadecimal digits, and the digits must form a number that is not the ASCII value of a letter, digit, -, +, or _.