The prolog header is the following piece of code that some XML documents start with:
<?xml version="y.x" encoding="zzzzz"?>
When the prolog exists in an XML document, it should be at the beginning of the file to enable programs to determine the encoding of non-UTF-8, non-UTF-16 files.
<!-- Generated file --> <!-- Noncompliant --> <?xml version="1.0" encoding="UTF-8"?> <firstNode> content </firstNode>
<?xml version="1.0" encoding="UTF-8"?> <!-- Generated file --> <firstNode> content </firstNode>