| 
Class Summary
 | 
| Field | 
Schema identity constraint field. | 
| Field.XPath | 
Field XPath. | 
| IdentityConstraint | 
Base class of Schema identity constraint. | 
| IDValue | 
Stores a value associated with a particular field of an identity constraint that
 has successfully matched some string in an instance document. | 
| Key | 
Schema key identity constraint. | 
| KeyRef | 
Schema key reference identity constraint. | 
| Selector | 
Schema identity constraint selector. | 
| Selector.XPath | 
Schema identity constraint selector XPath expression. | 
| Unique | 
Schema unique identity constraint. | 
| XPath | 
Bare minimum XPath parser. | 
| XPath.Axis | 
Axis. | 
| XPath.LocationPath | 
A location path representation for an XPath expression. | 
| XPath.NodeTest | 
Node test. | 
| XPath.Step | 
A location path step comprised of an axis and node test. | 
| XPathMatcher | 
XPath matcher. |