public GostSignedXml(XmlElement element)
        {
            if (element == null)
            {
                throw new ArgumentNullException("element");
            }

            _signedXml = new GostSignedXmlImpl(element);
        }
        public GostSignedXml(XmlDocument document)
        {
            if (document == null)
            {
                throw new ArgumentNullException("document");
            }

            _signedXml = new GostSignedXmlImpl(document);
        }
 public GostSignedXml()
 {
     _signedXml = new GostSignedXmlImpl();
 }