> in MS-DOS, file3 will have the following contents: > > BOM > contents from file1 > BOM > contents from file2 > > Is this in accordance with the Unicode standard
Nope. When concatenating two files (or any streams) of which the second one has a BOM, the second one should be deleted. However, there's a rule which states that if a U+FEFF character appears in the middle of a file, it should be treated as a zero width no-break space, that is, identical to a zero width word joiner (U+2060). So it's not as big as a problem as it may look. But now you've got me wondering whether there are any rules or guidelines for the situation where two files are joined, and the second one has a BOM, but the first one hasn't. Should the resulting file have a BOM? I.E. should a BOM be added to what was the contents of the first file? Pim Blokland
