XML Schema all element
Definition and usage
The all element specifies that child elements can appear in any order, and each child element can appear zero or once.
Element information
| Appearance times | One |
| Parent element | group, restriction (simpleContent), extension (simpleContent), restriction (complexContent), extension (complexContent), complexType |
| Content | annotation, element |
Syntax
<all id=ID maxOccurs=1 minOccurs=0|1 any attributes > (annotation?,element*) </all>
(The ? symbol indicates that the element can appear zero or once, while the * symbol indicates that the element can appear zero or multiple times in all elements.)
| Attribute | Description |
|---|---|
| id | Optional. The unique identifier of the element. |
| maxOccurs | Optional. The maximum number of times an element can appear. This value must be 1. |
| minOccurs | Optional. The minimum number of times an element can appear. This value can be an integer 0 or 1. To specify that the element is optional, set this attribute to 0. The default value is 1. |
| any attributes | Optional. Specifies any other attributes with non-schema namespace. |
Example 1
<xs:element name="person">
<xs:complexType>
<xs:all>
<xs:element name="firstname" type="xs:string"/>
<xs:element name="lastname" type="xs:string"/>
</xs:all>
</xs:complexType>
</xs:element>
The above example indicates that the "firstname" and "lastname" elements can appear in any order, and both elements must and can only appear once!
Example 2
<xs:element name="person">
<xs:complexType>
<xs:all minOccurs="0">
<xs:element name="firstname" type="xs:string"/>
<xs:element name="lastname" type="xs:string"/>
</xs:all>
</xs:complexType>
</xs:element>
The example above indicates that the "firstname" and "lastname" elements can appear in any order, and each element can appear zero or one time!
