public void setLineSeparator(String lineSeparator) {
        this.lineSeparator = lineSeparator;
    }
Set the line separator that will be used when serializing documents.
<p>
If this is not called then the serializer uses a default based on the
{@code line.separator} system property. 

@param lineSeparator the line separator to set.
jme3-plugins/src/xml/java/com/jme3/export/xml/DOMSerializer.java