how to handle Encoding Format ,XML Parsing Error: not well-formed?

Error is "XML Parsing Error: not well-formed" if its utf-8 encoding is choosen

Is der any other character like this which cause problems since i dont have control , whether am retriving all suitable character which doesnt harm the tag since my db holds even Word document content which has numerous symbols.
Why other encoding like utf-8 exists how can i choose encoding which works for all .

Yes, ISO-8859-1 which doesnot causes this error , so is it the best one for encoding someway am not able to understand encoding stuff ?

Note : Xml files are created using ASP Files from db . which is not a issue .

i want to know ,
how to handle this ?
what are the illegal character which doesnot support xml ? Like SQL apostrophe Causes error similarly is der anything in XML which shld be handled?
which encoding is the best that suit all ?

Am curious to know kinda bugs in  xml ?



ASP Code
<%
'I copied pasted the charcter which caused that error ??
Response.write("Character Making Issues How to handle these — "&" This is not minus symbol something else")
%>

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samplexml.html
LVL 18
Rajar AhmedConsultantAsked:
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sybeConnect With a Mentor Commented:
Set oXML = Server.CreateObject("MSXML2.DomDocument.6.0")
oXML.async = False: oXML.resolveExternals = False
Set oRoot = oXML.createElement("root")
oXML.appendChild oRoot

Do While Not Rs.Eof
    Set oNode = oXML.createElement("heydon")
    Set oSubNode = oXML.createElement("test")
    oSubNode.text = rs(0)
    oNode.AppendChild(oSubNode)
    Set oSubNode = oXML.createElement("test")
    oSubNode.text = rs(1)
    oNode.AppendChild(oSubNode)
    oRoot.AppendChild(oNode)

    oRS.MoveNext
Loop


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inxniCommented:
If you have to handle all kind of characters, I would suggest using utf-8 encoding.

But in your case, I think the problem is how to create xml or the data itself because you first hyphen and second hyphen are different characters (Different Code that is)

Can you give more information on how you create xml and when did the error occur?
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sybeCommented:
> Xml files are created using ASP Files from db . which is not a issue .

The question is *how* you create the xml from db. If you create pseudo-xml, by creating a string, you are very easily making errors.

The best is to use an XML-object to create XML. Or if your database supports it, use a "FOR XML" query.
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Rajar AhmedConsultantAuthor Commented:
hi inxni & sybe ,
 
   My apologies for delay in my response, this is my function which does the xml part for me .



<%
Function xml(query)
	Set rs = con.Execute(query)
	Recordcnt = rs.RecordCount
	if Recordcnt > 0 then
		Do While Not Rs.Eof
			xml_str = xml_str & "<heydon>" &vbcrlf _
				 & "<test2><![CDATA["&rs(0)&"]]></test2>" &vbcrlf _
				  & "<test><![CDATA["&rs(1)&"]]></test>" &vbcrlf _
				  & "</heydon>"
		RS.MoveNext
	Loop
   end if
        xml_str = "<?xml version=""1.0"" encoding=""utf-8""?><Homelin>"&xml_str&"</Homelin>"
		set fs=Server.CreateObject("Scripting.FileSystemObject")
        filepath = Server.MapPath("test.xml")
		set fname=fs.CreateTextFile(filepath,true)
		fname.WriteLine(xml_str)
		fname.Close
		set fname=nothing
		set fs=nothing
end function   
%>

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sybeCommented:
So you create pseudo-xml by creating a string. It's better to use MS XML objects.
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Rajar AhmedConsultantAuthor Commented:
does any samples are there . ?

wat will be difference from this ?
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