def referenced_node(id)
      nodes = document.xpath("//*[@ID='#{id}']")

      if nodes.size != 1
        raise SignatureError.new("Reference validation error: Invalid element references", "Expected 1 element with id #{id}, found #{nodes.size}")
      end

      nodes.first
    end
def referenced_node(id)
      nodes = document.xpath("//*[@ID='

      if nodes.size != 1
        raise SignatureError.new("Reference validation error: Invalid element references", "Expected 1 element with id 
      end

      nodes.first
    end
def referenced_node ( id ) nodes = document . xpath ( "//*[@ID='#{id}']" ) if nodes . size != 1 raise SignatureError . new ( "Reference validation error: Invalid element references" , "Expected 1 element with id #{id}, found #{nodes.size}" ) end nodes . first end
Looks up node by id, checks that there's only a single node with a given id
Looks up node by id checks that there s only a single node with a given id