In the first example, the name of all Use Case Diagrams in the project will be output. Note that "Name of ALL Use Case Diagrams" is the field name, which is a required and unique value for identifying this field.
In the second example, the description of all the diagrams in the project will be output.
In the third example, content will be output for each of the Use Case Diagrams and Class Diagrams in the project, based on the template MyTemplate.