Loops while specified condition is satisfied. The result is list made of processed bodies in each iteration.

<while condition="expression"
       index="index_var_name"
       maxloops="max_loops"
       empty="empty">
    body
</while>

Name	Required	Default	Description
condition	yes		Expression that is evaluated for every loop and if its value is true, the body is executed.
index	no		Name of the index variable, initial value for the first loop is 1.
maxloops	no		Limits number of iterations. There is no limit if it is not specified.
empty	no	no	Equal to surrounding body by empty element, producing empty result of iteration.