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When building forms (this is an example of the use of this tag, there can be many other), I usually tend to build a dictionary of validation errors as
["name_of_the_field": "This is the validation error to show"].With this tag, when looping over my fields, I could just test if the dictionary contains a validation error for a given field with
#if(containsKey(validationErrors, "name_of_the_field"))and then display the error if needed.