XML Schema choice element
Complete XML Schema Reference Definition and Usage
The XML Schema choice element is only allowed to contain in
Element Information
- Parent element: group, choice, sequence, complexType , restriction (both simpleContent and complexContent), extension (both simpleContent and complexContent)
grammar
<choice
id=ID
maxOccurs=nonNegativeInteger|unbounded
minOccurs=nonNegativeInteger
any attributes
>
(annotation?,(element|group|choice|sequence|any)*)
</choice>
id=ID
maxOccurs=nonNegativeInteger|unbounded
minOccurs=nonNegativeInteger
any attributes
>
(annotation?,(element|group|choice|sequence|any)*)
</choice>
(? Sign declares that the choice element, the element can occur zero or one time, * sign declares that the element can occur zero or more times.)
| 属性 | 描述 |
|---|---|
| id | 可选。规定该元素的唯一的 ID。 |
| maxOccurs | 可选。规定 choice 元素在父元素中可出现的最大次数。该值可以是大于或等于零的整数。若不想对最大次数设置任何限制，请使用字符串 "unbounded"。 默认值为 1。 |
| minOccurs | 可选。规定 choice 元素在父元素中可出现的最小次数。该值可以是大于或等于零的整数。若要指定该 any 组是可选的，请将此属性设置为零。 默认值为 1。 |
| any attributes | 可选。规定带有 non-schema 命名空间的任何其他属性。 |
Example 1
<xs:element name="person">
<xs:complexType>
<xs:choice>
<xs:element name="employee" type="employee"/>
<xs:element name="member" type="member"/>
</xs:choice>
</xs:complexType>
</xs:element>
<xs:complexType>
<xs:choice>
<xs:element name="employee" type="employee"/>
<xs:element name="member" type="member"/>
</xs:choice>
</xs:complexType>
</xs:element>
Examples of the above definition of "person" element must contain an "employee" element or a "member" element.
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