XML - Dealing with characters not allowed in XML tags

There are five characters in total, not allowed in XML tags, They could be either omitted or replaced with escape sequences:

<  replace with &#60; or &lt;

>  replace with &#62; or &gt;

"   replace with &#34; or &quot;

&  replace with &#38; or &amp;

'    replace with &#39; or &apos;