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Metadata that contains inline MathML or TeX code

Hi all,

I’d like to know what is the recommended way to encode metadata that contains inline MathML or TeX code, for instance:

<title-group>
        <article-title>Uma Reflexão de Professores sobre Demonstrações Relativas à Irracionalidade de <inline-formula><mml:math display="inline" id="m1"><mml:mrow><mml:msqrt><mml:mn>2</mml:mn></mml:msqrt></mml:mrow></mml:math></inline-formula> </article-title>
        <trans-title-group xml:lang="en">
          <trans-title>Teachers' Considerations on the Irrationality Proof of <inline-formula><mml:math display="inline" id="m2"><mml:mrow><mml:msqrt><mml:mn>2</mml:mn></mml:msqrt></mml:mrow></mml:math></inline-formula> </trans-title>
        </trans-title-group>
      </title-group> 

Thanks in advance.