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Before using a view for the first time, check the documentation at the top of the view file. The documentation lists its parameters and additional information about the view. For example, here are the comments from the "input/plaintext" view:
/** * Elgg long text input (plaintext) * Displays a long text input field that should not be overridden by wysiwyg editors. * * @uses $vars['value'] The current value, if any * @uses $vars['name'] The name of the input field * @uses $vars['class'] Additional CSS class * @uses $vars['disabled'] Input should be disabled */