The following table describes the XML-Data Reduced (XDR) schema elements.
| attribute | Refers to a declared attribute type that can appear within the scope of the named ElementType element. | 
| AttributeType | Defines an attribute type for use within the XDR schema Schema element. | 
| datatype | Specifies the data type for the ElementType or AttributeType element. | 
| description | Provides documentation about an ElementType or AttributeType element. | 
| element | Refers to a declared element type that can appear within the scope of the named ElementType element. | 
| ElementType | Defines an element type for use within the XDR schema Schema element. | 
| group | Organizes content into a group to specify a sequence. | 
| Schema | Identifies the start of a schema definition. | 
MSXML 2.0 and later provides support for XDR schema data types. For more information, see the XDR Schema Data Types Reference.
XDR Schema Data Types Reference