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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.
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.
help_image - declare an image filename with the image to be shown below the help text. The file must be located inside a problemtype folder named 'images'. e.g. help_image= "laminates.png".
state - Specifies one of two states for the field: normal, or hidden. Note that hidden <container> field can be used for storing hidden values, that you do not want to show in the user interface. It also permits to handle a Tcl function, by means of square brackets.
update_proc - It calls a TCL procedure, when clicking on the 'Ok' button in the window. Square brackets are not supported.
actualize_tree - Itupdates the information in the whole data tree, and automatically refresh data shown in the user interface. It is a boolean value as a 1 or 0 that indicates if it is activated or deactivated. If the data source is changed, such as new fields have been added or data values and field have been modified, all the user interface will reflect those changes. Furthermore, all the TCL procedures defined in the data tree will be called and the whole data tree will be refreshed. Therefore, this instruction must be carried out only when necessary.
actualize - This only updates a specified field in data tree. Note that only this specified field will be refreshed in the user interface, and not the whole data tree. It is a boolean value as a 1 or 0 that indicates if it is activated or deactivated.
del_cancel_button - It is a boolean value as a 1 or 0 that indicates if the cancel button is removed (1) or not (0). On the resulting window there will be only the 'OK' button, as follows, 
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