# Expect the data part and the `'?>'` token of a `PI` production.
	private fun expect_pi_data(target: String): Bool do
		if lexer.accept('?') then
			if lexer.expect('>', " at the end of a processing instruction") then
				model.fire_processing_instruction(target, null)
				return true
			else
				return false
			end
		else if lexer.accept_s then
			var data: Buffer = new FlatBuffer

			loop
				if lexer.accept('?') then
					if lexer.accept('>') then
							break
					else
						data.chars.push('?')
						if not lexer.expect_xml_char(data) then return false
					end
				else if not lexer.expect_xml_char(data) then
					return false
				end
			end
			model.fire_processing_instruction(target, data.to_s)
			return true
		else
			return lexer.fire_unexpected_char(" after a processing " +
					"instruction target. Expecting a white space or `?>`")
		end
	end