# Like `expect_xml_char`, but normalize white space and forbid `<`.
	#
	# SEE: The “3.3.3 Attribute-Value Normalization” section of any XML
	# recommendation.
	fun expect_att_value_char(buffer: Buffer): Bool do
		if is_s then
			buffer.chars.push(' ')
			read_char
			return true
		else if last_char == '<'.code_point then
			return fire_fatal_error("`<` is forbidden in attribute values.")
		else
			return expect_xml_char(buffer)
		end
	end