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It can contain the following fields: <value>, <container>, <condition>, <function>, <dependencies>
The parameters are as follows,
n - Name used to reference the field, especially when writing the .dat file.
There is a special container name n='materials' that has an extra meaning to declare that contain materials for import/export materials
pn - Label that will be visualized by the user. It can be translated.
icon - It allows to put an image in .png format in the data tree. The image should be stored inside the images folder of the problem type.
help - It displays a pop-up window of help information related to the task the user is performing.
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