code: public Properties getGlobalVariables() {
  		SortedProperties result = new SortedProperties();
  
  		NVPairs globalVariablesPairs = getGlobalVariablesPairs();
  		
  		if (globalVariablesPairs != null) {
  			for (JAXBElement<? extends NVPairType> nvPair : globalVariablesPairs.getNVPair()) {
  				String key = nvPair.getValue().getName();
  				String value = nvPair.getValue().getValue();
  				result.setProperty(key, value);
  			}
  		}
  		
  		return result;
  	}
docs: <p>
  The Global Variables are inside the NVPairs element with @name attribute
  equals to "Global Variables" at the root level.
  </p>
  
  @return The Global Variables of the xmlFile in a {@link SortedProperties}
  object.