XML Security Library performs signature or encryption by processing 
	input xml or binary data and a template that specifies a signature or 
	encryption skeleton: the transforms, algorithms, the key selection 
	process. A template has the same structure as the desired result but 
	some of the nodes are empty. XML Security Library gets the key for 
	signature/encryption from keys managers using the information from 
	the template, does necessary computations and puts the results in 
	the template. Signature or encryption context controls the whole 
	process and stores the required temporary data.