<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<xs:schema id="NewDataSet"
  xmlns=""
  xmlns:xs="http://www.w3.org/2001/XMLSchema"
  xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
  <xs:element
    name="NewDataSet"
    msdata:IsDataSet="true"
    msdata:MainDataTable="mydata"
    msdata:UseCurrentLocale="true">
    <xs:complexType>
      <xs:choice minOccurs="0" maxOccurs="unbounded">
        <xs:element name="mydata">
          <xs:complexType>
            <xs:attribute name="a" type="xs:boolean" />
            <xs:attribute name="b" type="xs:int" />
            <xs:attribute name="c" type="xs:string" />
          </xs:complexType>
        </xs:element>
      </xs:choice>
    </xs:complexType>
  </xs:element>
</xs:schema>

<?xml version="1.0" encoding="UTF-8"?>
<root>
  <mydata a="true" b="1" c="true"/>
</root>

var dt = new DataTable();
dt.ReadXmlSchema(@"D:\Trash\1.xsd");
dt.ReadXml(@"D:\Trash\1.xml");
foreach (DataRow r in dt.Rows)
  for (var i = 0; i < dt.Columns.Count;i++ )
    Console.WriteLine("{0} {1}", r[i], r[i].GetType());

True System.Boolean
1 System.Int32
true System.String

 XmlWriterSettings xs = new XmlWriterSettings();
  xs.Encoding = Encoding.GetEncoding(1251);
  XmlWriter xw = XmlWriter.Create("xmltest2.xml", xs);

  ds.WriteXml(xw);