![]() If the result of the bitwise AND is nonzero, the function evaluates to True otherwise, the function evaluates to False. The function performs a bitwise AND for two integer number arguments. The position function and its shorthand array reference are supported (on leaf nodes only).Namespace, processing, and comment nodes are not supported.Evaluation in reverse order is not supported.Generating a string value for a node name is not supported.The standard operators OR, AND, =, !=, =, >, and parentheses are supported.Predicates Any valid XPath expression is acceptable if the location paths conform to the following restrictions: The " *" character, which selects any character, is supported. Node Test Only node names and NCName tests are supported. The following are limitations of XPath 1.0 in regards to working with event logs:Īxis Only the Child (default) and Attribute (and its shorthand axis are supported. The W3C has a nice language specification ( XML Path Language (XPath)), which is a good reference. XPath is an industry standard that has been around since 1999. Each step is a structure of three parts: Axis, Node Test, and Predicate. The paths operate on event nodes, and they are composed of a series of steps. All valid paths begin with either a * or the keyword Event. The Consuming Events topic in the Windows Dev Center has a section called XPath 1.0 limitations, which is an excellent reference about the specific limitations of the XPath 1.0 subset for querying events and log files.Īn XPath query must resolve to select events, not a single event-it must resolve to events. This is because the Windows event log does not contain full support for the XPath query language. MSDN has an XPath Reference guide that is pretty good, but it is simply for reference. In addition, I can use XPath to compute values, but this really does not have much to do with querying data from event logs. What is XPath anyway? Well, XPath is a query language that is used for selecting nodes from an XML document. ![]() When I see XMLDocument, I think, “Structured XML.” Maybe I should back up just a little bit… So the FilterXPath parameter wants a simple string, and FilterXml wants an actual XML document. A close look at the syntax of the Get-WinEvent cmdlet, however, does provide a bit of a clue. Part of the problem is that there are nearly no examples to be found that illustrate using –FilterXPath. One of the things that confused me for a long time about using the Get-WinEvent cmdlet is the difference between the –FilterXPath parameter and the –FilterXml parameters. Microsoft Scripting Guy, Ed Wilson, is here. Summary: Microsoft Scripting Guy, Ed Wilson, explores XML and XPath.
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