## Uses of Class
org.apache.xpath.functions.Function

- Packages that use Function
  Package | Description
  --- | ---
  org.apache.xalan.extensions | Implementation of Xalan Extension Mechanism.
  org.apache.xalan.templates | Implements the `Templates` interface, and defines a set of classes that represent an XSLT stylesheet.
  org.apache.xpath | Implementation of XPath; for the most part, only classes meant for public use are found at this root level of the XPath packages.
  org.apache.xpath.axes | Implementation of XPath LocationPath support -- primary classes are LocPathIterator and UnionPathIterator.
  org.apache.xpath.functions | Implements XPath functions -- each function is derived from Function, FunctionOneArg, Function2Args, etc, with number-of-arguments checking being applied mainly at compile time -- this package only implements XPath functions, XSLT functions are found in the "templates" package.

- - ### Uses of Function in org.apache.xalan.extensions

    Methods in org.apache.xalan.extensions with parameters of type Function
    Modifier and Type | Method and Description
    --- | ---
    `boolean` | ExpressionVisitor.`visitFunction(ExpressionOwner owner, Function func)` If the function is an extension function, register the namespace.

  - ### Uses of Function in org.apache.xalan.templates

    Subclasses of Function in org.apache.xalan.templates
    Modifier and Type | Class and Description
    --- | ---
    `class` | `FuncDocument` Execute the Doc() function.
    `class` | `FuncFormatNumb` Execute the FormatNumber() function.
    `class` | `FuncKey` Execute the Key() function.

    Methods in org.apache.xalan.templates with parameters of type Function
    Modifier and Type | Method and Description
    --- | ---
    `boolean` | AbsPathChecker.`visitFunction(ExpressionOwner owner, Function func)` Visit a function.

  - ### Uses of Function in org.apache.xpath

    Methods in org.apache.xpath with parameters of type Function
    Modifier and Type | Method and Description
    --- | ---
    `boolean` | XPathVisitor.`visitFunction(ExpressionOwner owner, Function func)` Visit a function.

  - ### Uses of Function in org.apache.xpath.axes

    Methods in org.apache.xpath.axes with parameters of type Function
    Modifier and Type | Method and Description
    --- | ---
    `boolean` | HasPositionalPredChecker.`visitFunction(ExpressionOwner owner, Function func)` Visit a function.

  - ### Uses of Function in org.apache.xpath.functions

    Subclasses of Function in org.apache.xpath.functions
    Modifier and Type | Class and Description
    --- | ---
    `class` | `FuncBoolean` Execute the Boolean() function.
    `class` | `FuncCeiling` Execute the Ceiling() function.
    `class` | `FuncConcat` Execute the Concat() function.
    `class` | `FuncContains` Execute the Contains() function.
    `class` | `FuncCount` Execute the Count() function.
    `class` | `FuncCurrent` Execute the current() function.
    `class` | `FuncDoclocation` Execute the proprietary document-location() function, which returns a node set of documents.
    `class` | `FuncExtElementAvailable` Execute the ExtElementAvailable() function.
    `class` | `FuncExtFunction` An object of this class represents an extension call expression.
    `class` | `FuncExtFunctionAvailable` Execute the ExtFunctionAvailable() function.
    `class` | `FuncFalse` Execute the False() function.
    `class` | `FuncFloor` Execute the Floor() function.
    `class` | `FuncGenerateId` Execute the GenerateId() function.
    `class` | `FuncId` Execute the Id() function.
    `class` | `FuncLang` Execute the Lang() function.
    `class` | `FuncLast` Execute the Last() function.
    `class` | `FuncLocalPart` Execute the LocalPart() function.
    `class` | `FuncNamespace` Execute the Namespace() function.
    `class` | `FuncNormalizeSpace` Execute the normalize-space() function.
    `class` | `FuncNot` Execute the Not() function.
    `class` | `FuncNumber` Execute the Number() function.
    `class` | `FuncPosition` Execute the Position() function.
    `class` | `FuncQname` Execute the Qname() function.
    `class` | `FuncRound` Execute the round() function.
    `class` | `FuncStartsWith` Execute the StartsWith() function.
    `class` | `FuncString` Execute the String() function.
    `class` | `FuncStringLength` Execute the StringLength() function.
    `class` | `FuncSubstring` Execute the Substring() function.
    `class` | `FuncSubstringAfter` Execute the SubstringAfter() function.
    `class` | `FuncSubstringBefore` Execute the SubstringBefore() function.
    `class` | `FuncSum` Execute the Sum() function.
    `class` | `FuncSystemProperty` Execute the SystemProperty() function.
    `class` | `Function2Args` Base class for functions that accept two arguments.
    `class` | `Function3Args` Base class for functions that accept three arguments.
    `class` | `FunctionDef1Arg` Base class for functions that accept one argument that can be defaulted if not specified.
    `class` | `FunctionMultiArgs` Base class for functions that accept an undetermined number of multiple arguments.
    `class` | `FunctionOneArg` Base class for functions that accept one argument.
    `class` | `FuncTranslate` Execute the Translate() function.
    `class` | `FuncTrue` Execute the True() function.
    `class` | `FuncUnparsedEntityURI`

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