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The DOM Level 3 Core test noderemovechild27 gets the namedItem ent1 from the entities map and tries to remove it from the namedItem notation1 in notations, expecting NOT_FOUND or NO_MODIFICATION_ALLOWED. However since neither the DTD internal subset in hc_staff.xml nor the external subset in xhtml1-strict.dtd defines 'ent1', the Entity returned is null. The test then passes null to removeChild, with implementation-defined results. Suggest test should fetch 'ent4' rather than 'ent1'.