The element containing the signer's base64-encoded certificate.
Otherwise, the signature would include itself in the data to be signed, which is not correct.
Another example of a useful transform algorithm is the XPath Filter transform, which allows you to specify an XPath expression that selects a subset of nodes to be signed.
XML signatures are often described as being of one or more of three types: Perhaps the best way to describe an XML signature is to step through the contents of an example in detail.
The example that this article will use is an enveloped XML signature generated over the contents of an XML document, a sample purchase order.
According to the Capability Maturity Model (CMM) we can also define validation as The process of evaluating software during or at the end of the development process to determine whether it satisfies specified requirements. A product can pass while verification, as it is done on the paper and no running or functional application is required.