| Interface | Description | 
|---|---|
| ExpressionContext | An object that implements this interface can supply
 information about the current XPath expression context. | 
| Class | Description | 
|---|---|
| ExpressionVisitor | When  StylesheetHandlercreates 
 anXPath, the ExpressionVisitor
 visits the XPath expression. | 
| ExtensionHandler | Abstract base class for handling an extension namespace for XPath. | 
| ExtensionHandlerExsltFunction | Execute EXSLT functions, determine the availability of EXSLT functions, and the
 availability of an EXSLT result element. | 
| ExtensionHandlerGeneral | Class handling an extension namespace for XPath. | 
| ExtensionHandlerJava | Abstract base class handling the java language extensions for XPath. | 
| ExtensionHandlerJavaClass | Represents an extension namespace for XPath that handles java classes. | 
| ExtensionHandlerJavaPackage | Represents an extension namespace for XPath that handles java packages
 that may be fully or partially specified. | 
| ExtensionNamespaceContext | A sample implementation of NamespaceContext, with support for 
 EXSLT extension functions and Java extension functions. | 
| ExtensionNamespacesManager | Used during assembly of a stylesheet to collect the information for each 
 extension namespace that is required during the transformation process 
 to generate an  ExtensionHandler. | 
| ExtensionNamespaceSupport | During styleseet composition, an ExtensionNamespaceSupport object is created for each extension 
 namespace the stylesheet uses. | 
| ExtensionsTable | Class holding a table registered extension namespace handlers | 
| MethodResolver | Utility class to help resolve method overloading with Xalan XSLT 
 argument types. | 
| XPathFunctionImpl | A sample implementation of XPathFunction, with support for
 EXSLT extension functions and Java extension functions. | 
| XPathFunctionResolverImpl | A sample implementation of XPathFunctionResolver, with support for
 EXSLT extension functions and Java extension functions. | 
| XSLProcessorContext | Provides transformer context to be passed to an extension element. | 
Implementation of Xalan Extension Mechanism.
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