{{Code|$type}} is the signature type. It must either be {{Code|enveloped}} or {{Code|enveloping}} (detached signatures are not supported so far). '''Default is {{Code|enveloped}}'''.<br/>
{{Code|$xpath}} is an arbitrary XPath expression which specifies a subset of the document that is to be signed.<br/>
{{Code|$certificate}} is the digitial certificate used to sign the input document.<br/>
{{Code|$ext}} may either be an {{Code|$xpath}} expression or a {{Code|$certificate}}.<br/>