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Asked: 2026-06-03T18:30:27+00:00

For example. Are these xml tags acceptable or not. <xml> <3333>abc</3333> <ab#$3>def</ab#$3> </xml> My

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For example.
Are these xml tags acceptable or not.

<xml>
<3333>abc</3333>
<ab#$3>def</ab#$3>
</xml>

My question is can I create tags of integers values or a tag with Special characters ?

I tried this 

FileStream fs = new FileStream((filename), FileMode.Append);
XmlWriter w = XmlWriter.Create(fs);
w.WriteStartElement("3454");

and got the following error
{System.ArgumentException: Invalid name character in '3454'. The '3' character, hexadecimal value 0x33, cannot be included in a name.
at System.Xml.XmlWellFormedWriter.CheckNCName(String ncname)
at System.Xml.XmlWellFormedWriter.WriteStartElement(String prefix, String localName, String ns)
at System.Xml.XmlWriter.WriteStartElement(String localName)
at WindowsFormsApplication1.Form1.fn_setMapping(SqlString keyString, SqlString column, SqlString value)

Thank You

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1 Answer

  1. Editorial Team

    An XML element name cannot start with a number, so <3333> is not valid.

    As for which special characters are valid… see the spec for element names.

    NameStartChar      ::=      ":" | [A-Z] | "_" | [a-z] | [#xC0-#xD6] | [#xD8-#xF6] | [#xF8-#x2FF] | [#x370-#x37D] | [#x37F-#x1FFF] | [#x200C-#x200D] | [#x2070-#x218F] | [#x2C00-#x2FEF] | [#x3001-#xD7FF] | [#xF900-#xFDCF] | [#xFDF0-#xFFFD] | [#x10000-#xEFFFF]
NameChar       ::=      NameStartChar | "-" | "." | [0-9] | #xB7 | [#x0300-#x036F] | [#x203F-#x2040]
Name       ::=      NameStartChar (NameChar)*

    A valid name should start with a NameStartChar followed by any number of NameChar.

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