<!DOCTYPE doc [
	<!ELEMENT doc (norm+)>
	<!ELEMENT norm EMPTY>
	<!ATTLIST norm attr NMTOKENS #IMPLIED>
]>
<doc>
	<norm attr = ' foo bar
'/>
	<norm attr = 'foobar

'/>
	<norm attr = 'foo	 	bar	'/>
	<norm attr = ' foo &#x20;bar'/>
</doc>