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Figure: The xs:key Component

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/xmlschema11-1/#element-key.

Table 1. xs:key Properties
Property Name Description Possible Value
Name The key name. Always required. Any NCName.
ID The component ID. Any ID.
Component The edited component name. Not editable property.
Namespace The component namespace. Not editable property.
System ID The component system ID. Not editable property.