java.lang.Object
- net.sf.saxon.trace.Location

```
public class Location
extends java.lang.Object
```
This class holds constants identifying different kinds of location in a source stylesheet or query. These constants are used in the getConstructType() method of class InstructionInfo. Some of these locations represent points where the dynamic context changes, and they are therefore recorded as such on the context stack. Some of the locations represent points in the evaluation of a stylesheet (or query or XPath expression) that are notified to the trace listener. Some fulfil both roles.
Any constant used in StandardNames can be used as a Location. Such names are generally used to identify XSLT instructions. They are also used for equivalent constructs in XQuery, for example XSL_ELEMENT is used for a computed element constructor in XQuery. The constants in StandardNames are all in the range 0-1023, so constants defined in this class are outside this range.

The constants in this file are annotated with Q to indicate they can appear in XQuery trace output, T to indicate they can appear in XSLT trace output, and/or C to indicate that they can appear on the dynamic context stack.

Field Summary

Fields
Modifier and Type	Field	Description
`static int`	`BUILT_IN_TEMPLATE`	An XSLT built-in template rule.
`static int`	`CASE_EXPRESSION`	CASE clause within "typeswitch".
`static int`	`CONTROLLER`	The outer system environment, identified as the caller of a user query or stylesheet.
`static int`	`DEFAULT_EXPRESSION`	DEFAULT clause within "typeswitch".
`static int`	`ELSE_EXPRESSION`	An XPath or XQuery "else" clause.
`static int`	`EXTENSION_INSTRUCTION`	An XSLT instruction.
`static int`	`FILTER_EXPRESSION`	An XPath or XQuery filter expression.
`static int`	`FOR_EXPRESSION`	An XPath or XQuery "for" clause.
`static int`	`FUNCTION_CALL`	An XPath function call to a user-defined function.
`static int`	`GROUPING_KEY`	A grouping key in XSLT.
`static int`	`IF_EXPRESSION`	An XPath or XQuery "if" expression.
`static int`	`LAZY_EVALUATION`	Lazy evaluation of an expression (this code is used to identify a context created as a saved copy of an existing context, to be stored in a Closure).
`static int`	`LET_EXPRESSION`	An XQuery "let" clause, or an XSLT local variable (which compiles into a LET clause).
`static int`	`LITERAL_RESULT_ATTRIBUTE`	An attribute of an XSLT literal result element or of an XQuery direct element constructor.
`static int`	`LITERAL_RESULT_ELEMENT`	An XSLT literal result element, or an XQuery direct element constructor.
`static int`	`ORDER_BY_CLAUSE`	An order-by clause in a FLWOR expression.
`static int`	`PATH_EXPRESSION`	An XPath or XQuery path expression.
`static int`	`PATTERN`	An XSLT Pattern.
`static int`	`RETURN_EXPRESSION`	An XPath or XQuery "return" clause.
`static int`	`SAXON_EVALUATE`	An XPath expression constructed dynamically using saxon:evaluate (or saxon:expression).
`static int`	`SAXON_HIGHER_ORDER_EXTENSION_FUNCTION`	A higher-order extension function such as saxon:sum, saxon:highest.
`static int`	`SAXON_SERIALIZE`	The saxon:serialize() extension function.
`static int`	`SORT_KEY`	A sort key (or order-by key).
`static int`	`THEN_EXPRESSION`	An XPath or XQuery "then" clause.
`static int`	`TRACE_CALL`	An explicit call of the fn:trace() function.
`static int`	`TYPESWITCH_EXPRESSION`	An XPath or XQuery "typeswitch" expression.
`static int`	`UNCLASSIFIED`	Unclassified location.
`static int`	`VALIDATE_EXPRESSION`	An XPath or XQuery "validate" expression.
`static int`	`WHERE_CLAUSE`	A WHERE clause in a FLWOR expression.
`static int`	`XPATH_EXPRESSION`	XPath expression, otherwise unclassified.
`static int`	`XPATH_IN_XSLT`	Entry point to a top-level XPath expression within an XSLT stylesheet.

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

- Field Detail
  - CONTROLLER
```
public static final int CONTROLLER
```
    The outer system environment, identified as the caller of a user query or stylesheet. Usage:C
    
    See Also:
    
    Constant Field Values
  - EXTENSION_INSTRUCTION
```
public static final int EXTENSION_INSTRUCTION
```
    An XSLT instruction. The name of the instruction (which may be an extension instruction) can be obtained using the fingerprint property. Usage:T
    
    See Also:
    
    Constant Field Values
  - LITERAL_RESULT_ELEMENT
```
public static final int LITERAL_RESULT_ELEMENT
```
    An XSLT literal result element, or an XQuery direct element constructor. Usage:QT
    
    See Also:
    
    Constant Field Values
  - LITERAL_RESULT_ATTRIBUTE
```
public static final int LITERAL_RESULT_ATTRIBUTE
```
    An attribute of an XSLT literal result element or of an XQuery direct element constructor. Usage: QT
    
    See Also:
    
    Constant Field Values
  - FUNCTION_CALL
```
public static final int FUNCTION_CALL
```
    An XPath function call to a user-defined function. The "expression" property references the actual expression, of class ComputedExpression. The "target" property references the function being called, of class UserFunction. Usage: QTC
    
    See Also:
    
    Constant Field Values
  - BUILT_IN_TEMPLATE
```
public static final int BUILT_IN_TEMPLATE
```
    An XSLT built-in template rule. Usage: TC
    
    See Also:
    
    Constant Field Values
  - XPATH_IN_XSLT
```
public static final int XPATH_IN_XSLT
```
    Entry point to a top-level XPath expression within an XSLT stylesheet. Usage: TC
    
    See Also:
    
    Constant Field Values
  - FOR_EXPRESSION
```
public static final int FOR_EXPRESSION
```
    An XPath or XQuery "for" clause. Usage: Q
    
    See Also:
    
    Constant Field Values
  - LET_EXPRESSION
```
public static final int LET_EXPRESSION
```
    An XQuery "let" clause, or an XSLT local variable (which compiles into a LET clause). Usage: Q,T
    
    See Also:
    
    Constant Field Values
  - RETURN_EXPRESSION
```
public static final int RETURN_EXPRESSION
```
    An XPath or XQuery "return" clause. Usage: Q
    
    See Also:
    
    Constant Field Values
  - IF_EXPRESSION
```
public static final int IF_EXPRESSION
```
    An XPath or XQuery "if" expression. Usage: Q
    
    See Also:
    
    Constant Field Values
  - THEN_EXPRESSION
```
public static final int THEN_EXPRESSION
```
    An XPath or XQuery "then" clause. Usage: Q
    
    See Also:
    
    Constant Field Values
  - ELSE_EXPRESSION
```
public static final int ELSE_EXPRESSION
```
    An XPath or XQuery "else" clause. Usage: Q
    
    See Also:
    
    Constant Field Values
  - WHERE_CLAUSE
```
public static final int WHERE_CLAUSE
```
    A WHERE clause in a FLWOR expression. Usage: Q
    
    See Also:
    
    Constant Field Values
  - ORDER_BY_CLAUSE
```
public static final int ORDER_BY_CLAUSE
```
    An order-by clause in a FLWOR expression. Usage: Q
    
    See Also:
    
    Constant Field Values
  - TYPESWITCH_EXPRESSION
```
public static final int TYPESWITCH_EXPRESSION
```
    An XPath or XQuery "typeswitch" expression. Usage: Q
    
    See Also:
    
    Constant Field Values
  - CASE_EXPRESSION
```
public static final int CASE_EXPRESSION
```
    CASE clause within "typeswitch". Usage: Q
    
    See Also:
    
    Constant Field Values
  - DEFAULT_EXPRESSION
```
public static final int DEFAULT_EXPRESSION
```
    DEFAULT clause within "typeswitch". Usage: Q
    
    See Also:
    
    Constant Field Values
  - VALIDATE_EXPRESSION
```
public static final int VALIDATE_EXPRESSION
```
    An XPath or XQuery "validate" expression. Usage: Q
    
    See Also:
    
    Constant Field Values
  - FILTER_EXPRESSION
```
public static final int FILTER_EXPRESSION
```
    An XPath or XQuery filter expression. Usage: C
    
    See Also:
    
    Constant Field Values
  - PATH_EXPRESSION
```
public static final int PATH_EXPRESSION
```
    An XPath or XQuery path expression. Usage: C
    
    See Also:
    
    Constant Field Values
  - TRACE_CALL
```
public static final int TRACE_CALL
```
    An explicit call of the fn:trace() function. Usage: QT
    
    See Also:
    
    Constant Field Values
  - SAXON_EVALUATE
```
public static final int SAXON_EVALUATE
```
    An XPath expression constructed dynamically using saxon:evaluate (or saxon:expression). Usage: QTC
    
    See Also:
    
    Constant Field Values
  - SAXON_HIGHER_ORDER_EXTENSION_FUNCTION
```
public static final int SAXON_HIGHER_ORDER_EXTENSION_FUNCTION
```
    A higher-order extension function such as saxon:sum, saxon:highest. Usage: C
    
    See Also:
    
    Constant Field Values
  - SAXON_SERIALIZE
```
public static final int SAXON_SERIALIZE
```
    The saxon:serialize() extension function. Usage: C
    
    See Also:
    
    Constant Field Values
  - SORT_KEY
```
public static final int SORT_KEY
```
    A sort key (or order-by key). Usage: C
    
    See Also:
    
    Constant Field Values
  - GROUPING_KEY
```
public static final int GROUPING_KEY
```
    A grouping key in XSLT. Usage: C
    
    See Also:
    
    Constant Field Values
  - LAZY_EVALUATION
```
public static final int LAZY_EVALUATION
```
    Lazy evaluation of an expression (this code is used to identify a context created as a saved copy of an existing context, to be stored in a Closure). Usage: C
    
    See Also:
    
    Constant Field Values
  - PATTERN
```
public static final int PATTERN
```
    An XSLT Pattern. Usage: C
    
    See Also:
    
    Constant Field Values
  - XPATH_EXPRESSION
```
public static final int XPATH_EXPRESSION
```
    XPath expression, otherwise unclassified. The "expression" property references the actual expression, of class ComputedExpression. Used in fallback cases only.
    
    See Also:
    
    Constant Field Values
  - UNCLASSIFIED
```
public static final int UNCLASSIFIED
```
    Unclassified location. Used in fallback cases only.
    
    See Also:
    
    Constant Field Values

Class Location

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

CONTROLLER

EXTENSION_INSTRUCTION

LITERAL_RESULT_ELEMENT

LITERAL_RESULT_ATTRIBUTE

FUNCTION_CALL

BUILT_IN_TEMPLATE

XPATH_IN_XSLT

FOR_EXPRESSION

LET_EXPRESSION

RETURN_EXPRESSION

IF_EXPRESSION

THEN_EXPRESSION

ELSE_EXPRESSION

WHERE_CLAUSE

ORDER_BY_CLAUSE

TYPESWITCH_EXPRESSION

CASE_EXPRESSION

DEFAULT_EXPRESSION

VALIDATE_EXPRESSION

FILTER_EXPRESSION

PATH_EXPRESSION

TRACE_CALL

SAXON_EVALUATE

SAXON_HIGHER_ORDER_EXTENSION_FUNCTION

SAXON_SERIALIZE

SORT_KEY

GROUPING_KEY

LAZY_EVALUATION

PATTERN

XPATH_EXPRESSION

UNCLASSIFIED