xs:unique

Defines that an element or an attribute value must be unique within the scope. See more info at http://www.w3.org/TR/xmlschema-1/#element-unique.

Table 4.15. xs:unique properties
Property NameDescriptionPossible Values
NameThe unique 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.