KeyInfo instance from a mechanism-specific XMLStructure (ex: {@link DOMStructure}) instance.
@param xmlStructure a mechanism-specific XML structure from which to unmarshal the keyinfo from
@return the KeyInfo
@throws NullPointerException if xmlStructure is null
@throws ClassCastException if the type of xmlStructure isinappropriate for this factory
@throws MarshalException if an unrecoverable exception occurs during unmarshalling
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