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Besides writing the script, an output presentation type must be selected:

Each presentation type first interprets the data written by the script (by means of execution of the output statement) and then presents these data. In the following sections the characteristics of these presentation types are described.

Note that besides interpretation differences of the data, there are other kinds of differences between output types. For example, for some types of output it is possible to have more than one script for only one query, like with the color view. Also these kinds of differences are described per output type.

Scripts might apply changes to the model (see the scripting language section for details). When a script just applies changes, and does not have to output any data, the "no output" presentation type is appropriate: it ignores all output that is produced, and does not set up any presentation mechanism.