This page gives an overview of issues that occur in the XML and should be avoided
BOM-marker
Many XML processing applications (such as our Highwire Online platforms) do not process XML with the BOM Marker in place. Files including a BOM marker cannot be loaded. Existence of the marker should be avoided. XML-editors offer different options for avoiding the BOM-marker in the output. in Oxygen for example it is possible to set the in Preferences->"Encoding" the "UTF-8 BOM handling" to "Don't Write". In case of a file with a BOM-marker, the file should be saved again after making this change in the Preferences.
