code: public SXTag addNode(String tagName) throws IOException {
  		prepareToAddChildNode();
  		SXTag node = new SXTag(tagName, writer, 0, tabString);
  		lastChildNode = node;
  		return node;
  	}
docs: Adds a regular, named node to this document (usually one single root node)
  <b>WARNING:</b> This will close the last added tag, if applicable!
  
  @param tagName The name of the tag to add (contents between brackets)
  @return A Node abstraction.