A DOM-specific
XMLSignContext. This class contains additional methods to specify the location in a DOM tree where an
XMLSignature object is to be marshalled when generating the signature.
Note that DOMSignContext instances can contain information and state specific to the XML signature structure it is used with. The results are unpredictable if a DOMSignContext is used with different signature structures (for example, you should not use the same DOMSignContext instance to sign two different XMLSignature objects).