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# XML Schema notation Element * * Complete XML Schema Reference Manual](#) ## Definition and Usage The notation element describes the format of non-XML data in an XML document. ### Element Information * **Parent Element:** schema ### Syntax (annotation?) (The ? symbol declares that the element may appear zero or one time in the notation element.) | Attribute | Description | | --- | --- | | id | Optional. Specifies a unique ID for the element. | | name | Required. Specifies a name for the element. | | public | Required. A URI reference corresponding to the public identifier. | | system | A URI reference corresponding to the system identifier. | | any attributes | Optional. Specifies any other attributes with non-schema namespace. | ### Example 1 The following example shows notation for gif and jpeg formats using a viewing application view.exe: