<!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  bar'/>
</doc>
<!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  bar'/>
</doc>