Key

java.lang.Object
- com.saxonica.ee.schema.SchemaStructure
- - com.saxonica.ee.schema.IdentityConstraint
  - - com.saxonica.ee.schema.Key

All Implemented Interfaces:

SerializableSchemaComponent, UserSchemaComponent, javax.xml.transform.SourceLocator, Location, SchemaComponent, org.xml.sax.Locator
```
public class Key
extends IdentityConstraint
```
A class that represents the XML Schema Identity Constraint: Key.

- Constructor Summary
  
  Constructors
  Constructor Description
  
  Key()
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  java.lang.String getConstraintCategory()
  The type of constraint: one of "key", "unique", or "keyref"
  - Methods inherited from class com.saxonica.ee.schema.IdentityConstraint
    addField, elaborate, fixup, getComponentAsFunction, getConstraintName, getFields, getName, getSelector, getTargetNamespace, isOrdered, isSameDeclaration, serialize, setConstraintName, setOrdered, setSelector, typeCheck, validate
  - Methods inherited from class com.saxonica.ee.schema.SchemaStructure
    getColumnNumber, getConfiguration, getFixupStatus, getGeneratedId, getLineNumber, getPublicId, getRedefinitionLevel, getSchemaDocumentURI, getSystemId, getValidationStatus, hasSameLocation, isValidationNeeded, lookForCycles, makeXPathExpressionPropertyRecord, saveLocation, setConfiguration, setFixupStatus, setGeneratedId, setLineNumber, setLocator, setRedefinitionLevel, setSchemaDocumentURI, setSystemId, setValidationStatus
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
  - Methods inherited from interface net.sf.saxon.type.SchemaComponent
    getRedefinitionLevel, getValidationStatus
  - Methods inherited from interface com.saxonica.ee.schema.UserSchemaComponent
    lookForCycles

- Constructor Detail
  - Key
```
public Key()
```
- Method Detail
  - getConstraintCategory
```
public java.lang.String getConstraintCategory()
```
    Description copied from class: IdentityConstraint
    
    The type of constraint: one of "key", "unique", or "keyref"
    
    Specified by:
    
    getConstraintCategory in class IdentityConstraint
    
    Returns:
    
    one of "key", "unique", or "keyref" (note the spelling)