code: private void countPropertyQualifier(UsageStatistics usageStatistics,
  			PropertyIdValue property, int count) {
  		addPropertyCounters(usageStatistics, property);
  		usageStatistics.propertyCountsQualifier.put(property,
  				usageStatistics.propertyCountsQualifier.get(property) + count);
  	}
docs: Counts additional occurrences of a property as qualifier property of
  statements.
  
  @param usageStatistics
  statistics object where count is stored
  @param property
  the property to count
  @param count
  the number of times to count the property