code: public boolean add(String parent, String namespaceURI, String localName, String value) {
  		NodeList nodes = domDocument.getElementsByTagName(parent);
  		if (nodes.getLength() == 0)
  			return false;
  		Node pNode;
  		Node node;
  		for (int i = 0; i < nodes.getLength(); i++) {
  			pNode = nodes.item(i);
  			NamedNodeMap attrs = pNode.getAttributes();
  			for (int j = 0; j < attrs.getLength(); j++) {
  				node = attrs.item(j);
  				if (namespaceURI.equals(node.getNodeValue())) {
  					node = domDocument.createElement(localName);
  					node.appendChild(domDocument.createTextNode(value));
  					pNode.appendChild(node);
  					return true;
  				}
  			}
  		}
  		return false;
  	}
docs: Adds a tag.
  @param	namespaceURI	the URI of the namespace
  @param	parent			the tag name of the parent
  @param	localName		the name of the tag to add
  @param	value			the new content for the tag
  @return	true if the content was successfully added
  @since	2.1.6