使用XML模式定义DateSet：test.xsd

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schema-microsoft-com:xml-msdata" elementFormDefault="qualified" attributeFormDefault="unqualified" >
 <xs:element name="ComplexType" msdata:IsDataSet="true">
  <xs:complexType>
   <xs:choice maxOccurs="unbounded">

表一：
    <xs:element name="book">
     <xs:complexType>
      <xs:sequence>
       <xs:element name="ISBN" type="xs:string"/>
       <xs:element name="author" type="xs:positiveInteger"/>
      </xs:sequence>
     </xs:complexType>
    </xs:element>

表二：
    <xs:element name="author">
     <xs:complexType>
      <xs:sequence>
       <xs:element name="authorid" type="xs:positiveInteger"/>
       <xs:element name="NAME" type="xs:string"/>
      </xs:sequence>
     </xs:complexType>
    </xs:element>
   </xs:choice>
  </xs:complexType>

下列为两个表的联系设置：

设置Key键：

从表：
  <xs:key name="authorkey">
   <xs:selector xpath=".//author"/>
   <xs:field xpath="authorid"/>
  </xs:key>

设置keyref形成关系

主表：
  <xs:keyref name="authorref" refer="authorkey">
   <xs:selector xpath=".//book"/>
   <xs:field xpath="author"/>
  </xs:keyref>
 </xs:element>
</xs:schema>
总结：Key->keyref->关系

下面在C#中如何显示DateSet相关信息

class Program
 {
        [STAThread]
        static void Main(string[] args)
        {  DataSet ds = new DataSet();
            ds.ReadXmlSchema("test.xsd");
            foreach(DataTable dt in ds.Tables )
            { Console.WriteLine("{0}", dt.TableName);}
            foreach (DataColumn dc in dt.Columns)
            { Console.Write("{0},<{1}>",dc.ColumnName,dc.DataType.ToString());}

显示：
book
ISBN,<System.String>author,<System.UInt64>
author
authorid,<System.UInt64>NAME,<System.String>

            Console.WriteLine("\n");
            }
            foreach (DataRelation dr in ds.Relations)
            { Console.WriteLine("{0},{1}",dr.RelationName,dr.Nested.ToString());}

显示：----authorref,False
         }
}

总结：DateSet ReadXmlSchema(具有DateSet描述的xsd文档);就可以了；