XML Schema Elements

The following table describes the XML Schema definition language (XSD) elements.

all	Allows the elements in the group to appear (or not appear) in any order in the containing element.
annotation	Defines an annotation.
any	Enables any element from the specified namespace(s) to appear in the containing sequence or choice element.
anyAttribute	Enables any attribute from the specified namespace(s) to appear in the containing complexType element or in the containing attributeGroup element.
appinfo	Specifies information to be used by applications within an annotation element.
attribute	Declares an attribute.
attributeGroup	Groups a set of attribute declarations so that they can be incorporated as a group for complex type definitions.
choice	Allows one and only one of the elements contained in the selected group to be present within the containing element.
complexContent	Contains extensions or restrictions on a complex type that contains mixed content or elements only.
complexType	Defines a complex type, which determines the set of attributes and the content of an element.
documentation	Specifies information to be read or used by users within an annotation element.
element	Declares an element.
extension (simpleContent)	Contains extensions on simpleContent. This extends a simple type or a complex type that has simple content.
extension (complexContent)	Contains extensions on complexContent.
field	Specifies an XML Path Language (XPath) expression that specifies the value (or one of the values) used to define an identity constraint (unique, key, and keyref elements).
group	Groups a set of element declarations so that they can be incorporated as a group into complex type definitions.
import	Identifies a namespace whose schema components are referenced by the containing schema.
include	Includes the specified schema document in the target namespace of the containing schema.
key	Specifies that an attribute or element value (or set of values) must be a key within the specified scope. The scope of a key is the containing element in an instance document. A key must be unique, non-nillable, and always present.
keyref	Specifies that an attribute or element value (or set of values) correspond to those of the specified key or unique element.
list	Defines a simpleType element as a list of values of a specified data type.
notation	Contains the definition of a notation to describe the format of non-XML data within an XML document. An XML Schema notation declaration is a reconstruction of XML 1.0 NOTATION declarations.
redefine	Allows simple and complex types, groups, and attribute groups that are obtained from external schema files to be redefined in the current schema.
restriction (simpleType)	Defines constraints on a simpleType definition.
restriction (simpleContent)	Defines constraints on a simpleContent definition.
restriction (complexContent)	Defines constraints on a complexContent definition.
schema	Contains the definition of a schema.
selector	Specifies an XPath expression that selects a set of elements for an identity constraint (unique, key, and keyref elements).
sequence	Requires the elements in the group to appear in the specified sequence within the containing element.
simpleContent	Contains extensions or restrictions on a complexType element with character data or a simpleType element as content and contains no elements.
simpleType	Defines a simple type, which determines the constraints on and information about the values of attributes or elements with text-only content.
union	Defines a simpleType element as a collection of values from specified simple data types.
unique	Specifies that an attribute or element value (or a combination of attribute or element values) must be unique within the specified scope. The value must be unique or nil.

XML Schema Elements

See Also