GlobalParam

java.lang.Object
- net.sf.saxon.expr.Expression
- - net.sf.saxon.instruct.Instruction
  - - net.sf.saxon.instruct.GeneralVariable
    - - net.sf.saxon.instruct.GlobalVariable
      - net.sf.saxon.instruct.GlobalParam

All Implemented Interfaces:

java.io.Serializable, javax.xml.transform.SourceLocator, LocationProvider, SaxonLocator, Binding, Container, EvaluableItem, SequenceIterable, TailCallReturner, InstructionInfo, org.xml.sax.Locator
```
public final class GlobalParam
extends GlobalVariable
```
The compiled form of a global xsl:param element in the stylesheet or an external variable declared in the prolog of a Query.
The xsl:param element in XSLT has mandatory attribute name and optional attribute select. It can also be specified as required="yes" or required="no". In standard XQuery external variables are always required, and no default value can be specified; but Saxon provides an extension pragma that allows a query to specify a default.

See Also:

Serialized Form

Field Summary
- Fields inherited from class net.sf.saxon.instruct.GeneralVariable
  evaluationMode, referenceCount, slotNumber, variableQName
- Fields inherited from class net.sf.saxon.expr.Expression
  EVALUATE_METHOD, ITERATE_METHOD, locationId, PROCESS_METHOD, staticProperties

Constructor Summary

Constructors
Constructor Description

GlobalParam()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`ValueRepresentation`	`evaluateVariable(XPathContext context)`	Evaluate the variable
`int`	`getInstructionNameCode()`	Get the name of this instruction for diagnostic and tracing purposes

Methods inherited from class net.sf.saxon.instruct.GlobalVariable
getExecutable, getHostLanguage, getSelectValue, isGlobal, lookForCycles, processLeavingTail, setContainsLocals, setExecutable, setHostLanguage

Methods inherited from class net.sf.saxon.instruct.Instruction
assembleParams, assembleTunnelParams, computeCardinality, computeSpecialProperties, createsNewNodes, dynamicError, evaluateAsString, getConstructType, getImplementationMethod, getSourceLocator, isXSLT, process, promote

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

Methods inherited from interface net.sf.saxon.expr.Container
getLocationProvider, replaceSubExpression

Methods inherited from interface javax.xml.transform.SourceLocator
getColumnNumber, getLineNumber, getPublicId, getSystemId

- Constructor Detail
  - GlobalParam
```
public GlobalParam()
```
- Method Detail
  - getInstructionNameCode
```
public int getInstructionNameCode()
```
    Get the name of this instruction for diagnostic and tracing purposes
    
    Overrides:
    
    getInstructionNameCode in class GeneralVariable
    
    Returns:
    
    the name of this instruction, as a name pool name code
  - evaluateVariable
```
public ValueRepresentation evaluateVariable(XPathContext context)
                                     throws XPathException
```
    Evaluate the variable
    
    Specified by:
    
    evaluateVariable in interface Binding
    
    Overrides:
    
    evaluateVariable in class GlobalVariable
    
    Parameters:
    
    context - the XPath dynamic evaluation context
    
    Returns:
    
    the result of evaluating the variable
    
    Throws:
    
    XPathException