Represents the Uniform Resource Identifier (URI) for the XML Path Language (XPath). This field is constant.
The value of the SignedXml.XmlDsigXPathTransformUrl field is "http://www.w3.org/TR/1999/REC-xpath-19991116".
Use this field to conveniently supply a value to one of the URI attributes of an element used for XMLDSIG.
The System.Security.Cryptography.Xml.XmlDsigXPathTransform class implements the transform described by the SignedXml.XmlDsigXPathTransformUrl field.
For more information, see the World Wide Web Consortium (W3C) specification at http://www.w3.org/TR/1999/REC-xpath-19991116.