All Known Subinterfaces:

LocalBinding

All Known Implementing Classes:

Assignation, EagerLetExpression, ForExpression, GlobalParam, GlobalVariable, LetExpression, LocalParam, LocalVariableBinding, OuterForExpression, ParserExtension.TemporaryXSLTVariableBinding, QuantifiedExpression, UndeclaredVariable, UserFunctionParameter, XPathVariable
```
public interface Binding
```
Binding is a interface used to represent the run-time properties and methods associated with a variable: specifically, a method to get the value of the variable.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`addReference(VariableReference ref, boolean isLoopingReference)`	Register a variable reference that refers to the variable bound in this expression
`Sequence`	`evaluateVariable(XPathContext context)`	Evaluate the variable
`IntegerValue[]`	`getIntegerBoundsForVariable()`	If the variable is bound to an integer, get the minimum and maximum possible values.
`SequenceType`	`getRequiredType()`	Get the declared type of the variable
`StructuredQName`	`getVariableQName()`	Get the name of the variable
`boolean`	`isAssignable()`	Test whether it is permitted to assign to the variable using the saxon:assign extension element.
`boolean`	`isGlobal()`	Indicate whether the binding is local or global.

- Method Detail
  - getRequiredType
```
SequenceType getRequiredType()
```
    Get the declared type of the variable
    
    Returns:
    
    the declared type
  - getIntegerBoundsForVariable
```
IntegerValue[] getIntegerBoundsForVariable()
```
    If the variable is bound to an integer, get the minimum and maximum possible values. Return null if unknown or not applicable
    
    Returns:
    
    a pair of integers containing the minimum and maximum values for the integer value; or null if the value is not an integer or the range is unknown
  - evaluateVariable
```
Sequence evaluateVariable(XPathContext context)
                   throws XPathException
```
    Evaluate the variable
    
    Parameters:
    
    context - the XPath dynamic evaluation context
    
    Returns:
    
    the result of evaluating the variable
    
    Throws:
    
    XPathException - if an error occurs while evaluating the variable
  - isGlobal
```
boolean isGlobal()
```
    Indicate whether the binding is local or global. A global binding is one that has a fixed value for the life of a query or transformation; any other binding is local.
    
    Returns:
    
    true if the binding is global
  - isAssignable
```
boolean isAssignable()
```
    Test whether it is permitted to assign to the variable using the saxon:assign extension element. This will only be for an XSLT global variable where the extra attribute saxon:assignable="yes" is present.
    
    Returns:
    
    true if the binding is assignable
  - getVariableQName
```
StructuredQName getVariableQName()
```
    Get the name of the variable
    
    Returns:
    
    the name of the variable, as a structured QName
  - addReference
```
void addReference(VariableReference ref,
                  boolean isLoopingReference)
```
    Register a variable reference that refers to the variable bound in this expression
    
    Parameters:
    
    ref - the variable reference
    
    isLoopingReference - - true if the reference occurs within a loop, such as the predicate of a filter expression

Interface Binding

Method Summary

Method Detail

getRequiredType

getIntegerBoundsForVariable

evaluateVariable

isGlobal

isAssignable

getVariableQName

addReference