Create a simple DOM and having it serialize to:

 <?xml version="1.0" ?>
 <root>
     <element>
         Some text here
     </element>
 </root>

USER>set writer=##class(%XML.Writer).%New()
USER>set writer.Charset="UTF-8"
USER>Set writer.Indent=1
USER>Set writer.IndentChars="    "
USER>set sc=writer.OutputToString()
USER>set sc=writer.RootElement("root")
USER>set sc=writer.Element("element")
USER>set sc=writer.WriteChars("Some text here")
USER>set sc=writer.EndElement()
USER>set sc=writer.EndRootElement()
USER>Write writer.GetXMLString()

<?xml version="1.0" encoding="UTF-8"?>
<root>
    <element>Some text here</element>
</root>
