When to encode XML String

[SB]

String in XML must be encoded, ie., &, <, >, ', "
must be replaced with &amp;, &lt;, &gt;, &apos;, &quot;.
But it is not clear to me when to encode a particular
string, ie., &amp;, when present in the string correctly,
might get further encoded as &amp;amp;. Can somebody
explain to me how to handle xml strings before giving
the xml to a parser?

thanks, st.

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