XML / XSL

<cities>
  <city>
    <name>Aberdeen</name> 
  </city>
  <city>
    <name>Dundee</name> 
  </city>
</cities>

<cities>
  <city name='Aberdeen' /> 
  <city name='Dundee' /> 
</cities>

using System.IO;
using System.Xml;
class FormatXml {
	static void Main(string[] args) {
		XmlTextReader r = new XmlTextReader(args[0]);
		XmlTextWriter w = new XmlTextWriter(new StreamWriter(args[1]));
		r.WhitespaceHandling = WhitespaceHandling.None;
		w.Formatting = Formatting.Indented;
		w.Indentation = 1;
		w.IndentChar = '\t';
		w.QuoteChar = '\'';
		w.WriteNode(r, false);
		w.Close();
	}
}