# Receive an object for locating the origin of SAX document events.
	#
	# SAX parsers are strongly encouraged (though not absolutely
	# required) to supply a locator: if it does so, it must supply
	# the locator to the application by invoking this method before
	# invoking any of the other methods in the ContentHandler
	# interface.
	#
	# The locator allows the application to determine the end
	# position of any document-related event, even if the parser is
	# not reporting an error. Typically, the application will
	# use this information for reporting its own errors (such as
	# character content that does not match an application's
	# business rules). The information returned by the locator
	# is probably not sufficient for use with a search engine.
	#
	# Note that the locator will return correct information only
	# during the invocation of the events in this interface. The
	# application should not attempt to use it at any other time.
	#
	# Parameter:
	#
	# * `locator`: object that can return the location of
	# any SAX document event.
	#
	# SEE: `sax::SAXLocator`
	fun document_locator=(locator: SAXLocator) do end