XML Schema sequence Element
Complete XML Schema Reference
Definition and Usage
The sequence element specifies that the child elements must appear in a sequence. Each child element can occur from 0 to any number of times.
Element Information
- Parent elements: group, choice, sequence, complexType, restriction (both simpleContent and complexContent), extension (both simpleContent and complexContent)
Syntax
<sequence
id=ID
maxOccurs=nonNegativeInteger|unbounded
minOccurs=nonNegativeInteger
any attributes
>
(annotation?,(element|group|choice|sequence|any)*)
</sequence>
(The ? sign declares that the element can occur zero or one time inside the sequence element)
| Attribute | Description |
|---|---|
| id | Optional. Specifies a unique ID for the element |
| maxOccurs | Optional. Specifies the maximum number of times the sequence 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 sequence element can occur in the parent element. The value can be any number >= 0. Default value is 1 |
| any attributes | Optional. Specifies any other attributes with non-schema namespace |
Example 1
This example shows a declaration for an element called "personinfo", which must contain the following five elements in order; "firstname", "lastname", "address", "city", and "country":
<xs:element name="personinfo">
<xs:complexType>
<xs:sequence>
<xs:element name="firstname" type="xs:string"/>
<xs:element name="lastname" type="xs:string"/>
<xs:element name="address" type="xs:string"/>
<xs:element name="city" type="xs:string"/>
<xs:element name="country" type="xs:string"/>
</xs:sequence>
</xs:complexType>
</xs:element>
Example 2
This example shows a declaration for an element called "pets" that can have zero or more of the following elements, dog and cat, in the sequence element:
<xs:element name="pets">
<xs:complexType>
<xs:sequence minOccurs="0" maxOccurs="unbounded">
<xs:element name="dog" type="xs:string"/>
<xs:element name="cat" type="xs:string"/>
</xs:sequence>
</xs:complexType>
</xs:element>
Complete XML Schema Reference
