What are invalid characters in XML

The only illegal characters are &, < and > (as well as " or ' in attributes, depending on which character is used to delimit the attribute value: attr="must use &quot; here, ' is allowed" and attr='must use &apos; here, " is allowed').

They’re escaped using XML entities, in this case you want &amp; for &.

Really, though, you should use a tool or library that writes XML for you and abstracts this kind of thing away for you so you don’t have to worry about it.

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