<element name="SignatureProperty" type="ds:SignaturePropertyType"/> 
   <complexType name="SignaturePropertyType" mixed="true">
     <choice maxOccurs="unbounded"> 
       <any namespace="##other" processContents="lax"/>
       <!-- (1,1) elements from (1, unbounded) namespaces -->
     </choice>
     <attribute name="Target" type="anyURI" use="required"/> 
     <attribute name="Id" type="ID" use="optional"/> 
   </complexType>
 

   XMLSignatureFactory factory = XMLSignatureFactory.getInstance("DOM");
   SignatureProperty property = factory.newSignatureProperty
	(Collections.singletonList(content), "#Signature-1", "TimeStamp");