[Java] [XML signature] Add prefix and ID to Signature tag

//Creating a signature context
//Prefix Signature tags (including all child elements) with setDefaultNamespacePrefix
DOMSignContext dsc = new DOMSignContext(privateKey, document.getDocumentElement());
dsc.setDefaultNamespacePrefix("dsig");

XMLSignatureFactory fac = XMLSignatureFactory.getInstance("DOM");

(Omission)

//Sign.
//Set the ID in the 4th argument of newXMLSignature
XMLSignature signature = fac.newXMLSignature(si, ki, null, "a", null);
signature.sign(dsc);

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