code: private static StringBuffer doAppendCdataSection(StringBuffer buffer, String cdataContent)
  	{
  		buffer.append(SEQUENCE__CDATA__OPEN).append(cdataContent).append(SEQUENCE__CDATA__CLOSE);
  		return buffer;
  	}
docs: Add a cdata section to a StringBuffer.
  
  If the buffer is null, a new one is created.
  
  @param buffer
  StringBuffer to fill
  @param cdataContent
  the cdata content
  @return the buffer