Most objects in MDL have four verb types associated with them: Add, Delete, Make, and Update; for example, CatAdd, CatDelete, CatMake, and CatUpdate.
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Add verbs add the object to the model. An error is issued if the object already exists. Examples for this verb type show you how to use it to create an object and specify its required settings.
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Delete verbs remove the object from the model. An error is issued if the object does not exist.
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Make verbs add the object if it does not already exist, and update the object if it does exist. Make verbs combine the functionality of both the Add and Update verbs. Examples for this verb type show the object definitions that are generated by Transformer when you save a model as an .mdl file.
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Update verbs update existing objects. An error is issued if the object does not exist.
