code: private Set<String> getDataUsageNameList() {
          Set<String> result = new HashSet<>();
          String propertyValue = getProperty(ProcessContextProperty.ALL_DATA_USAGES);
          if (propertyValue == null) {
              return result;
          }
          StringTokenizer attributeTokens = StringUtils.splitArrayString(propertyValue, String.valueOf(ArrayUtils.VALUE_SEPARATION));
          while (attributeTokens.hasMoreTokens()) {
              String nextToken = attributeTokens.nextToken();
              result.add(nextToken);
          }
          return result;
      }
docs: Returns all property names for data usages, <br>
  i.e. the value of the context property ACTIVITY_DATA_USAGES.
  
  @return A set of all used property names for data usages.