# Copy constructor.
	#
	# Create a persistent copy of the current state of a locator.
	# When the original locator changes, this copy will still keep
	# the original values (and it can be used outside the scope of
	# `ContentHandler` methods).
	#
	# Parameters:
	#
	# * `locator`: locator to copy.
	init from(locator: SAXLocator) do
		public_id = locator.public_id
		system_id = locator.system_id
		line_number = locator.line_number
		column_number = locator.column_number
	end