Package com.saxonica.hof

The package com.saxonica.hof contains code to support higher-order functions.

See:
Description

Class Summary

AbstractFunctionItem	Abstract superclass (and factory class) for implementations of FunctionItem
CoercedFunction	A function item obtained by coercing a supplied function; this adds a wrapper to perform dynamic type checking of the arguments in any call, and type checking of the result.
CurriedFunction	A function obtained by currying another function, that is, the result of calling fn:partial-apply
DynamicFunctionCallDefinition	This class implements the extension function saxon:call(), which calls a FirstClassFunction previously set up using saxon:function().
DynamicFunctionCallDefinition.DynamicFunctionCall
DynamicFunctionConstructor	This class implements the extension function saxon:function(), which returns a FirstClassFunction object representing the function named in the first argument.
FirstClassFunction	A FirstClassFunction is a value that encapsulates a function; it can therefore be manipulated like any other value: for example it can be assigned to a variable and passed as a parameter to a function.
FunctionItemExpression	A Literal is an expression whose value is constant: it is a class that implements the Expression interface as a wrapper around a Value.
FunctionSequenceCoercer	An FunctionSequenceCoercer performs function coercion on a sequence of function items
FunctionType	An instance of this class represents a specific function item type, for example function(xs:int) as xs:boolean
InlineFunctionWithExternals	A function written as an inline anonymous function, that has one or more references to local variables declared outside the body of the function
UserFunctionItem	A UserFunctionItem is a function item representing a call on a user-defined function.

Package com.saxonica.hof Description

The package com.saxonica.hof contains code to support higher-order functions.

Higher-order functions are supported in XQuery 1.1 using native language syntax, and they are also available in other environments (including XSLT) using the Saxon extension functions saxon:function() and saxon:call().

Michael H. Kay
Saxonica Limited
12 June 2009