Binding

All Known Implementing Classes:

Assign, Assignation, EagerLetExpression, ForExpression, GeneralVariable, GlobalParam, GlobalVariable, JAXPVariable, LetExpression, LocalParam, LocalVariable, PositionVariable, QuantifiedExpression, UserFunctionParameter, WithParam, 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
`ValueRepresentation`	`evaluateVariable(XPathContext context)`	Evaluate the variable
`int`	`getLocalSlotNumber()`	If this is a local variable held on the local stack frame, return the corresponding slot number.
`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
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SequenceType getRequiredType()
```
    Get the declared type of the variable
    
    Returns:
    
    the declared type
  - evaluateVariable
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ValueRepresentation evaluateVariable(XPathContext context)
                              throws XPathException
```
    Evaluate the variable
    
    Parameters:
    
    context - the XPath dynamic evaluation context
    
    Returns:
    
    the result of evaluating the variable
    
    Throws:
    
    XPathException
  - 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
  - getLocalSlotNumber
```
int getLocalSlotNumber()
```
    If this is a local variable held on the local stack frame, return the corresponding slot number. In other cases, return -1.
    
    Returns:
    
    the slot number on the local stack frame
  - getVariableQName
```
StructuredQName getVariableQName()
```
    Get the name of the variable
    
    Returns:
    
    the name of the variable, as a structured QName

Interface Binding

Method Summary

Method Detail

getRequiredType

evaluateVariable

isGlobal

isAssignable

getLocalSlotNumber

getVariableQName