fields.php

<?php
class JWF_Fields
{

	protected static $fieldtypes = array();
	
	/**
	 * Using a private constructor to make sure the class doesn't get instantiated
	 *
	 * @access private
	 */
	private function __construct() {}
	
	/**
	 * Initialize functionality
	 *
	 * @since 0.1
	 */
	public static function init()
	{
		add_action( 'init', array( 'JWF_Fields', 'register_builtin_fieldtypes' ) );
	}
	
	/**
	 * Load built-in field types
	 *
	 * @since 0.1
	 */
	public static function register_builtin_fieldtypes()
	{
	}
	
	/**
	 * Get built-in field IDs
	 *
	 * @since 0.1
	 *
	 * @return array Returns an array of built-in fields IDs (strings)
	 */
	public static function get_builtin_fieldtypes()
	{
	}

}

JWF_Fields::init();
?>