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/!DOCTYPE/!ELEMENT b/@idx;VC:Notation Attributes:declared;m
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/!DOCTYPE/!ELEMENT b/@idx;VC:Notation Attributes:declared;m
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  <!ELEMENT b EMPTY>
  <!ATTLIST b idx NOTATION (abc | def) #IMPLIED >
]><a></a>
#is-document
#errors
/!DOCTYPE/!ELEMENT b/@idx;VC:Notation Attributes:declared;m
/!DOCTYPE/!ELEMENT b/@idx;VC:Notation Attributes:declared;m
/!DOCTYPE/!ELEMENT b/@idx;VC:No Notation on Empty Element;m
/a;unknown namespace element;u