org.linkedin.util-core/src/main/java/org/linkedin/util/xml/XML.java
@Override
  public void addTag(String tagName, String tagValue)
  {
    if(tagValue == null)
      addEmptyTag(tagName);
    else
    {
      addOpeningTag(tagName);
      _xml.append(XMLUtils.xmlEncode(tagValue));
      addClosingTag(tagName);
    }
  }
@Override
  public void addTag(String tagName, String tagValue)
  {
    if(tagValue == null)
      addEmptyTag(tagName);
    else
    {
      addOpeningTag(tagName);
      _xml.append(XMLUtils.xmlEncode(tagValue));
      addClosingTag(tagName);
    }
  }
Adds a tag

@param tagName the name of the tag to add
@param tagValue the value of the tag to add