# Package com.saxonica.expr

This package contains classes used to support expressions and instructions that are new in XPath 3.0, XQuery 3.0, or XSLT 3.0, and that don't fit conveniently into a more specialized category (such as streaming). Most of these classes represent internally-generated expressions or functions on the expression tree; the package also includes the XPath 3.0 and XQuery 3.0 parser extensions, and the Saxon-EE optimizer.

None of these classes will be used by typical user applications.

- Class Summary
  Class | Description
  --- | ---
  ForMemberExpression | A ForMemberExpression maps an expression over the members of an array.
  JavaExtensionFunctionCall | This class acts as a container for an extension function defined to call a method in a user-defined class.
  ObjectLookupExpression | Saxon extension: a lookup expression of the form X?Y where X is a Java external object and Y is a method defined on that object
  QueryLibraryImpl | Concrete implementation of a separately-compiled XQuery library
  SaxonSyntaxExtension | Parser extension for syntax in XPath that is accepted only in Saxon-PE and -EE.
  SaxonSyntaxExtension.UnderscoreFunctionDetails |
  StaticQueryContextPE | A version of StaticQueryContext for Saxon-PE
  XQueryParserExtensionPE | Parser extension for syntax in XQuery Update and/or XQuery 3.0 that is supported only in Saxon-PE or -EE.