Validating web

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The article will also use this sample in the subsequent sections on using the API.

XML Sample 1 shows the contents of the purchase order before it is signed.

The API contains six new packages, as Table 1 indicates. For this example, you will use DOM to parse the XML data that you will be signing.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.For instance, it allows you to sign more than one piece of data -- in binary or XML -- and to use any underlying cryptographic signature algorithm.An XML signature can sign arbitrary data, whether it is XML or binary.