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The Xalan and Saxon processors support the use of extension elements and extension functions. Unlike a literal result element, which the stylesheet simply transfers to the result tree, an extension element performs an action. The extension is usually used because the XSLT stylesheet fails in providing adequate functions for accomplishing a more complex task.

For more information about how to use extensions, see the following links:

To set an XSLT processor extension (a directory or a jar file), use the Extensions button in the Edit scenario dialog box.