question: @ Override public void element ( String elementName , Augmentations augs ) throws XNIException { if ( fMixed && fValidation ) { if ( fMixedElementTypes . contains ( elementName ) ) { fErrorReporter . reportError ( XMLMessageFormatter . XML_DOMAIN , "DuplicateTypeInMixedContent" , new Object [ ] { fDTDElementDeclName , elementName } , XMLErrorReporter . SEVERITY_ERROR ) ; } else { fMixedElementTypes . add ( elementName ) ; } } if ( fDTDGrammar != null ) fDTDGrammar . element ( elementName , augs ) ; if ( fDTDContentModelHandler != null ) { fDTDContentModelHandler . element ( elementName , augs ) ; } }
target:  A referenced element in a mixed or children content model.