function split(items, delim) {
		return items ? items.split(delim || ' ') : [];
	}
Schema validator class.

@class tinymce.html.Schema
@example
 if (tinymce.activeEditor.schema.isValidChild('p', 'span'))
   alert('span is valid child of p.');

 if (tinymce.activeEditor.schema.getElementRule('p'))
   alert('P is a valid element.');

@class tinymce.html.Schema
@version 3.4