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# XML Schema all Element * * Complete XML Schema Reference](#) * * * ## Definition and Usage The element specifies that the child elements can appear in any order, and each child element can appear zero or one time. ### Element Information * **Parent elements:** group, complexType, restriction (both simpleContent and complexContent), extension (both simpleContent and complexContent) ### Syntax (annotation?,element*) (The ? symbol declares that the element can appear zero or one time, while the * symbol declares that the element can appear zero or more times across all elements.) | Attribute | Description | | --- | --- | | id | Optional. A unique identifier for this element. | | maxOccurs | Optional. The maximum number of times the element can occur. This value must be 1. | | minOccurs | Optional. The minimum number of times the element can occur. This value can be the 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 namespaces. | ### Example 1 The example above specifies that the "firstname" and "lastname" elements can appear in any order, and both elements must appear exactly once! ### Example 2 <xs:eleme