To edit a function as a textual XPath expression using the Properties Window:
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If the Properties window is not visible, select Window > Properties from the Oracle JDeveloper menu bar.
The default location of the Properties window is below the XSLT Map Editor.
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Click the expression folder in the canvas pane, in the area bordering the function icon. The full XPath Expression for the function appears in the right pane of the Properties window.
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Edit the XPath Expression, as desired. You can also refer to Steps 2 to 3 in the preceding procedure.
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To update the XSLT with the changes, click the Apply Changes icon in the upper left corner of the Properties window. Alternatively, click anywhere in the XSLT Map Editor.