doc.silverstripe.org/sapphire/forms/DatalessField.php

<?php
/**
 * Abstract class for all fields without data.
 * Labels, headings and the like should extend from this.
 * 
 * @package forms
 * @subpackage fields-dataless
 */
class DatalessField extends FormField {
	
	/**
	 * @var bool $allowHTML
	 */
	protected $allowHTML;
	
	/**
	 * @param string $name
	 * @param string $title The label itslef
	 * @param string $class An HTML class to apply to the label (Deprecated: use addExtraClass())
	 * @param boolean $allowHTML Determine if the tag content needs to be escaped (Deprecated: use setAllowHTML())
	 * @param Form $form
	 */
	function __construct($name, $title = null, $className = "", $allowHTML = false, $form = null) {
		if($className) $this->extraClasses = array($className);
		$this->allowHTML = $allowHTML;

		parent::__construct($name, $title, null, $form);
	}
	
	/**
	 * Function that returns whether this field contains data.
	 * Always returns false. 
	 */
	function hasData() { return false; }
	
	/**
	 * Returns the field's representation in the form.
	 * For dataless fields, this defaults to $Field.
	 */
	function FieldHolder() {
		return $this->Field();
	}

	/**
	 * Returns the field's representation in a field group.
	 * For dataless fields, this defaults to $Field.
	 */
	function SmallFieldHolder() {
		return $this->Field();
	}

	/**
	 * Returns a readonly version of this field
	 */
	function performReadonlyTransformation() {
		$clone = clone $this;
		$clone->setReadonly(true);
		return $clone;
	}
	
	/**
	 * @param bool $bool
	 */
	function setAllowHTML($bool) {
		$this->allowHTML = $bool;
	}
	
	/**
	 * @return bool
	 */
	function getAllowHTML() {
		return $this->allowHTML;
	}
}
?>