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javax.xml.xpath

Interface XPathFunction

Contents

  • public interface XPathFunction

    XPathFunction provides access to XPath functions.

    Functions are identified by QName and arity in XPath.

    Since:
    1.5

    • Method Detail

      • evaluate

        Object evaluate(List args)
                throws XPathFunctionException

        Evaluate the function with the specified arguments.

        To the greatest extent possible, side-effects should be avoided in the definition of extension functions. The implementation evaluating an XPath expression is under no obligation to call extension functions in any particular order or any particular number of times.

        Parameters:
        args - The arguments, null is a valid value.
        Returns:
        The result of evaluating the XPath function as an Object.
        Throws:
        XPathFunctionException - If args cannot be evaluated with this XPath function.
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