SaxWriter always writes startDocument() and endDocument()

I'd like to use SaxWriter to produce part of XML file, but SaxWriter always writes xml declaration, it always calls startDocument() and endDocument(). So generated document looks like:

<?xml version="1.0"?>
<root>
<?xml version="1.0"?>
<string>a</string>
<?xml version="1.0"?>
<string>b</string>
<?xml version="1.0"?>
<string>c</string>
<?xml version="1.0"?>
<string>d</string>
</root>

Thanks.