13.1. The KeyValue Element
The KeyValue element contains the actual value of a single public key that may be useful in validating a signature, decrypting data, or agreeing on a key. See Table 13-1 for its identifier. The following sections specify structures for DSA, RSA, and DH keys. The KeyValue element can in clude application-defined keys as element content qualified by another namespace or as character content. Element content is the preferred method because namespaces provide a mechanism to avoid conflicts.
XMLDSIG defines the KeyValue element syntax as follows:
<!-- XMLDSIG KeyValue DTD --> <!ELEMENT KeyValue (#PCDATA|DSAKeyValue|RSAKeyValue %KeyValue.ANY;)* >
As expanded by XML Encryption, it would be something like this:
<!-- Extended ...