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schema question How to describe this in corresponding schema There are several elements in the <complexType></complexType> tag pair , some of these elements has the attribute that at least one of them should be appear in the xml, all of the elements in the tag pair should be appeared in any order(xs:all) How to describe this situation in schema    Êղؠ  ·ÖÏí   ¶¥(0)

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×îºÃÓÃÖÐÎÄÃèÊö£¬ok£¡£¡£¡ <xsd:complex name='cType'>   <xsd:all>     <xsd:element name='elem1'>       <xsd:complexType>          <xsd:sequence/>          <!-- ´øÊôÐÔµÄÔªËØ -->          <xsd:attribteGroup ref='attrG'/>      </xsd:complexType>    </xsd:element>    <xsd:elemnt name='elem2>        ....     </xsd:element>     <xsd:element .... <xsd:complexType>