<!DOCTYPE test [
<!ELEMENT test EMPTY> <!ATTLIST test attr1 NMTOKENS #IMPLIED>
]> <!– Should be invalid due to www.w3.org/XML/xml-V10-2e-errata#E20 –> <test attr1=“ a	b ”/>
<!DOCTYPE test [
<!ELEMENT test EMPTY> <!ATTLIST test attr1 NMTOKENS #IMPLIED>
]> <!– Should be invalid due to www.w3.org/XML/xml-V10-2e-errata#E20 –> <test attr1=“ a	b ”/>