XML Schema choice Element
Complete XML Schema Reference
Definition and Usage
XML Schema choice element allows only one of the elements contained in the <choice> declaration to be present within the containing element.
Element Information
- Parent elements: group, choice, sequence, complexType, restriction (both simpleContent and complexContent), extension (both simpleContent and complexContent)
Syntax
<choice
id=ID
maxOccurs=nonNegativeInteger|unbounded
minOccurs=nonNegativeInteger
any attributes
>
(annotation?,(element|group|choice|sequence|any)*)
</choice>
(The ? sign declares that the element can occur zero or one time, and the * sign declares that the element can occur zero or more times inside the choice element)
| Attribute | Description |
|---|---|
| id | Optional. Specifies a unique ID for the element |
| maxOccurs | Optional. Specifies the maximum number of times the choice element can occur in the parent element. The value can be any number >= 0, or if you want to set no limit on the maximum number, use the value "unbounded". Default value is 1 |
| minOccurs | Optional. Specifies the minimum number of times the choice element can occur in the parent the element. The value can be any number >= 0. Default value is 1 |
| any attributes | Optional. Specifies any other attributes with non-schema namespace |
Example
<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>
The example above defines an element named "person" which must contain either a "employee" element or a "member" element.
Complete XML Schema Reference
