# Element tree structure

The element tree structure is used to display all available element properties within a project / subproject. It is drawn from the project template and contains all element properties, including custom defined fields.

<figure><img src="http://aquawiki.andagon.com/pictures/drex_element_tree_structure_2_custom.png" alt=""><figcaption></figcaption></figure>

Within the hierarchical data structure tree, there are lists, fields, and calculated fields. For each list within the hierarchical structure, a band can be defined to iterate through its elements. The direct usage of a sub-list in a band only returns its topmost element, since it does not automatically iterate through the list, and is therefore not recommended. Calculated fields are fields that return a value based on a customizable function. For example, a custom field can return 1 if a test has passed and 0 if not. This practice enables you to count all passed tests, which would cause a lot of scripting work otherwise.&#x20;

### **Related Elements** <a href="#related_elements" id="related_elements"></a>

All related elements are shown in the dependency view of an element. For example, related elements of a test scenario are the test cases it contains. You can access this information and iterate through the related elements in the report designer.

&#x20;&#x20;

<figure><img src="http://aquawiki.andagon.com/pictures/drex_element_tree_structure_2_custom_2.png" alt=""><figcaption></figcaption></figure>

### **Example of integrating the data variables into the report** <a href="#example_of_integrating_the_data_variables_into_the_report" id="example_of_integrating_the_data_variables_into_the_report"></a>

In the example below, we visually indicated how the field list elements are related to the report layout designer.&#x20;

<figure><img src="http://aquawiki.andagon.com/pictures/drex_element_tree_structure_2_custom_3.png" alt=""><figcaption></figcaption></figure>

### **Calculated Fields** <a href="#calculated_fields" id="calculated_fields"></a>

The values of calculated fields are determined by a formula and dynamically calculated during the creation of the report.

&#x20;

<figure><img src="http://aquawiki.andagon.com/pictures/drex_element_tree_structure_2_custom_4.png" alt=""><figcaption></figcaption></figure>

An example expression which could define the value of a calculated field:

```csharp
Iif ([LastExecutionStatusInvariant] == 'Passed', 1, 0)
```


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