question: protected boolean declAlreadyDeclared ( String prefix ) { int startDecls = m_contextIndexes . peek ( ) ; java . util . Vector prefixMappings = m_prefixMappings ; int nDecls = prefixMappings . size ( ) ; for ( int i = startDecls ; i < nDecls ; i += 2 ) { String prefixDecl = ( String ) prefixMappings . elementAt ( i ) ; if ( prefixDecl == null ) continue ; if ( prefixDecl . equals ( prefix ) ) return true ; } return false ; }
target:  Check if a declaration has already been made for a given prefix.