<<< native [ EOver False (EIdentifier "xxx") (ESymbol Accent "\175") , ESymbol Rel "=" , EOver False (EStyled TextItalic [ EIdentifier "xxx" ]) (ESymbol Accent "\175") ] >>> mml $$\overline{\mathrm{xxx}}=\overline{\mathrm{𝑥𝑥𝑥}}$$