xs:key

Specifies an attribute or element value as a key (unique, non-nullable, and always present) within the containing element in an instance document. See more info at http://www.w3.org/TR/xmlschema-1/#element-key.

Table 4.16. xs:key properties
Property NameDescriptionPossible Value
NameThe key name. Always required.Any NCName.
IDThe component id.Any ID.
ComponentThe edited component name.Not editable property.
NamespaceThe component namespace.Not editable property.
System IDThe component system id.Not editable property.