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annotation¡¢attribute¡¢attributeGroup¡¢anyAttribute
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id=ID
name=NCName
ref=QName
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(annotation?),((attribute|attributeGroup)*,anyAttribute?))
</attributeGroup>
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<xs:attributeGroup name="personattr">
  <xs:attribute name="attr1" type="string"/>
  <xs:attribute name="attr2" type="integer"/>
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<xs:complexType name="person">
  <xs:attributeGroup ref="personattr"/>
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XML Schema choice ÔªËØ
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this.DropDownList1.DataSource = dv;
this.DropDownList1.DataTextField = "text";
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