Escape sequence for XML

Are there escape codes to allow the display of XML such as this: " some text ". Of course the attribute mark-up is missing!
Edit:
<attribute> incredible! </attribute>

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AFAIK, standard html/xml character escaping

<some text> is done by &lt;some text&gt;

  • & = &amp;
  • < = &lt;
  • > = &gt;