The first section contains the special information fields, and the second section contains the text of the abstract. If a field does not apply to your paper, omit it. Do not use any 8-bit characters in this file. Typically such characters are generated when authors try to include special accented characters, such as for their names. If you really want to know why, you can read about this problem and other details .
Abstracts are automatically processed, so it is important to adhere to the format.
The most important processing is line-wrapping to 80 characters. This is preferable for most abstracts, but there are occasions when lines shouldn't be wrapped together, e.g. if the abstract is a table of contents. To allow for this, lines with leading white space are not wrapped. Thus, you should not submit an abstract that contains leading white space unless you explicitly prefer no wrapping. And there are some more examples .