| Interface | Description | 
|---|---|
| FieldActivator | Interface for a field activator. | 
| ValueStore | Interface for storing values associated to an identity constraint. | 
| Class | Description | 
|---|---|
| Field | Schema identity constraint field. | 
| Field.XPath | Field XPath. | 
| IdentityConstraint | Base class of Schema identity constraint. | 
| KeyRef | Schema key reference identity constraint. | 
| Selector | Schema identity constraint selector. | 
| Selector.XPath | Schema identity constraint selector XPath expression. | 
| UniqueOrKey | Schema unique or key identity constraint. | 
| XPathMatcher | XPath matcher. | 
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