Additional information items concerning the generation of the
EncryptedData or EncryptedKey can be placed in an
EncryptionProperty element (e.g., date/time stamp or the serial
number of cryptographic hardware used during encryption). The Target
attribute identifies the EncryptedType structure being
described. anyAttribute permits the inclusion of attributes from the XML
namespace to be included (i.e., xml:space,
xml:lang, and xml:base).