Special Character Must Be Replaced

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XML use <element-name> to denote an element, so you have to replace special characters. For example, you have to use < to represent the < character.

Special Character	Replaced With
<	&lt;
>	&gt;
&	&amp;
"	&quot;
'	&apos;
\t (TAB)	&#x09;	Required only if use it in a XML attribute's value
\n (Linefeed)	&#x0a;	Required only if use it in a XML attribute's value

Alternatively, you could tell XML parser not to interpret a piece of text by using CDATA as the following.

 <zscript>
 <![CDATA[
 void myfunc(int a, int b) {
     if (a < 0 && b > 0) {
         //do something
     }
 ]]>
 </zscript>

It is suggested to always add <![CDATA[ ]]> inside your <zscript> </zscript>. Thus you don't have to worry about escape sequences for special characters like "&", "<". In addition, the code is much easier to read and maintain.