How to ensure an xml entity has a valid name

问题

I have an app that generates a bunch of xml based off of some data from a source that I don't control. Basically I'm turning that data into an xml doc for serving via rss feeds. I may be getting data like

2_br=1
3_br=0

and I'm turning it into the following xml

<2_br>1</2_br>
<3_br>0</3_br>

Obviously an xml tag can't start with a digit. I couldn't find anywhere a list of valid characters. Does it exists somewhere? I'm basically just going to prefix and invalid starting character or replace an inline invalid character with an _.

It's not hard to do, but basically I just cant find a list of invalid characters for an xml tag name.

回答1:

How about this:Extensible Markup Language (XML) 1.0 (Fifth Edition)

回答2:

XmlConvert.IsNCNameChar()

and

XmlConvert.IsStartNCNameChar()

can be used to validate a XML-tag name:

char[] validTagNameChars = pDesiredTagName.Where(ch => XmlConvert.IsNCNameChar(ch)).ToArray();
string validTagName = new string (validTagNameChars);
if (validTagName == "" || !XmlConvert.IsStartNCNameChar(validTagName[0]))
  validTagName = "_" + validTagName;

来源：https://stackoverflow.com/questions/4617212/how-to-ensure-an-xml-entity-has-a-valid-name

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