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Encode string to XML-friendly form

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I need to write some text string to xml file and validate it later. 
For validation to be successful i need to replace some symbols (include Unicode):

Func _stringReplaceSymbols_EncodeToXML(ByRef $sString)
    $sString = StringRegExpReplace($sString,"(*UCP)\p{C}","")
    $sString = StringReplace($sString,"&","&"); "&amp"
    $sString = StringReplace($sString,"<","&lt;");  "&lt"
    $sString = StringReplace($sString,">","&gt;");  "&gt"
    $sString = StringReplace($sString,"'","&apos;");"&apos"
    $sString = StringReplace($sString,'"',"&quot;");"&quot"

Is it cover all cases of incompatibility? or maybe faster solution exist? 

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Do you have schema (XSD file) for this XML file ?


Edited by mLipok

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