IdentityField

java.lang.Object
- com.saxonica.ee.schema.SchemaStructure
- - com.saxonica.ee.schema.FieldOrSelector
  - - com.saxonica.ee.schema.IdentityField

All Implemented Interfaces:

UserSchemaComponent, javax.xml.transform.SourceLocator, Location, SchemaComponent, org.xml.sax.Locator
```
public class IdentityField
extends FieldOrSelector
```
The field selector for an IdentityConstraint

Field Summary
- Fields inherited from class com.saxonica.ee.schema.FieldOrSelector
  selectExpression

Constructor Summary

Constructors
Constructor Description

IdentityField(java.lang.String xpath)
Creates a new IdentityField.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`BuiltInAtomicType`	`getBuiltInBaseType()`
`int`	`getCardinality(ExpressionVisitor visitor, ContextItemStaticInfo contextItemType)`	Get the static cardinality of the expression, that is the number of nodes the field xpath will select for each node selected by the selector xpath.
`boolean`	`isAscending()`
`boolean`	`isListValued()`
`void`	`setAscending(boolean upwards)`
`void`	`setBuiltInBaseType(BuiltInAtomicType builtInBaseType, boolean listValued)`

Methods inherited from class com.saxonica.ee.schema.FieldOrSelector
getNamespaceContext, getSelectExpression, getSelection, getXPath, getXPathDefaultNamespace, setNamespaceContext, setSelectExpression, setSelection, setXPath, setXPathDefaultNamespace

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - IdentityField
```
public IdentityField(java.lang.String xpath)
```
    Creates a new IdentityField.
    
    Parameters:
    
    xpath - the xpath for the IdentityField. Must not be null.
- Method Detail
  - getBuiltInBaseType
```
public BuiltInAtomicType getBuiltInBaseType()
```
  - isListValued
```
public boolean isListValued()
```
  - setBuiltInBaseType
```
public void setBuiltInBaseType(BuiltInAtomicType builtInBaseType,
                               boolean listValued)
```
  - setAscending
```
public void setAscending(boolean upwards)
```
  - isAscending
```
public boolean isAscending()
```
  - getCardinality
```
public int getCardinality(ExpressionVisitor visitor,
                          ContextItemStaticInfo contextItemType)
                   throws XPathException
```
    Get the static cardinality of the expression, that is the number of nodes the field xpath will select for each node selected by the selector xpath.
    
    Parameters:
    
    visitor - the expression visitor
    
    contextItemType - the type of the context item, and information about whether a context item will always be provided or not
    
    Returns:
    
    the static cardinality
    
    Throws:
    
    XPathException - if an error is found during the evaluation