Byte Order Mark skipping #51
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Try reading two files with Byte Order Marks. test_sax_fsm_1_utf8_bom.in is UTF8 encoded (but this is not mentioned in the XML header). We should be able to read this as long as we don't trip up with the BOM. test_sax_fsm_1_utf16_bom.in is UTF16 encoded with a BOM and encoding declared in the XML. We should not be able to read this (we should get a non-well-formed error).
For a UTF8-encoded XML file with a Byte Order Mark and characters that are also ascii characters, we should be able to read the file. If the first character is not- recognisable assume we are dealing with a BOM, skip it, and carry on. We'll then either read the file OK or we end up with something that is not well-formed (e.g. because it is a different encoding).
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Skip any Byte Order Marks and keep trying. We may be able to read some files.