Some records may contain fields that have values split across multiple lines in the source file. These are commonly prefixed with 1 or more space characters to indicate that they belong with the preceding line.
The RIS spec wasn't very clear as to whether there had to be leading spaces (and if so how many) or simply an absence of the 6-character Regex. But we should take it as epoz specifies
Some records may contain fields that have values split across multiple lines in the source file. These are commonly prefixed with 1 or more space characters to indicate that they belong with the preceding line.
See: http://lists.okfn.org/pipermail/openbiblio-dev/2012-February/000618.html for the first identification of this problem.