An "elements-only" complex type contains an element that contains only other elements.
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Complex Types Containing Elements Only
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An XML element, "person", that contains only other elements:
Ò»¸öXMLÔªËØ"person"Ö»º¬ÓÐÆäËüÔªËØ£º

<person>
<firstname>John</firstname>
<lastname>Smith</lastname>
</person>

You can define the "person" element in a schema, like this:
Äã¿ÉÒÔÔÚһƪschemaÀﶨÒå"person"ÔªËØ£¬ÈçÏÂËùʾ£º

<xs:element name="person">
  <xs:complexType>

    <xs:sequence>
      <xs:element name="firstname" type="xs:string"/>
      <xs:element name="lastname" type="xs:string"/>

    </xs:sequence>
  </xs:complexType>
</xs:element>

Notice the <xs:sequence> tag. It means that the elements defined ("firstname" and "lastname") must appear in that order inside a "person" element.
Çë×¢Òâ<xs:sequence>±êÇ©¡£Õâ±íʾËù¶¨ÒåµÄÔªËØ("firstname" ºÍ "lastname")±ØÐëÔÚ"person"ÔªËØÀïÒÔ<xs:sequence>±êÇ©¶¨ÒåµÄ´ÎÐò³öÏÖ¡£

Or you can give the complexType element a name, and let the "person" element have a type attribute that refers to the name of the complexType (if you use this method, several elements can refer to the same complex type):
»òÕߣ¬Äã¿ÉÒÔΪcomplexTypeÔªËض¨ÒåÒ»¸öÃû³Æ£¬ÈÃ"person"ÔªËØ°üº¬Ò»¸öÀàÐÍÊôÐÔ£¬¸ÃÀàÐÍÊôÐÔµÄÃû³Æ¿ÉÒÔÒýÓÃcomplexTypeÔªËصÄÃû³Æ£¨Èç¹ûÄãÓÃÉÏÊö·½·¨£¬¼¸¸öÔªËØ¿ÉÒÔͬʱÒýÓÃÏàͬµÄ¸´ºÏÀàÐÍ£©£º

<xs:element name="person" type="persontype"/>

<xs:complexType name="persontype">
  <xs:sequence>
    <xs:element name="firstname" type="xs:string"/>

    <xs:element name="lastname" type="xs:string"/>
  </xs:sequence>
</xs:complexType>

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