What version of XPath is supported?

Version, any additions or omissions...

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#### Document Details

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* ID: d3f92236-144b-1073-0ee4-edfd2e822823
* Version Independent ID: d523425f-6344-a4c2-1376-4fe65de6b742
* Content: [Extensions.XPathSelectElement Method (System.Xml.XPath)](https://docs.microsoft.com/en-us/dotnet/api/system.xml.xpath.extensions.xpathselectelement?f1url=https%3A%2F%2Fmsdn.microsoft.com%2Fquery%2Fdev15.query%3FappId%3DDev15IDEF1%26l%3DEN-US%26k%3Dk(System.Xml.XPath.Extensions.XPathSelectElement);k(TargetFrameworkMoniker-.NETFramework,Version%3Dv4.7.2);k(DevLang-csharp)%26rd%3Dtrue&view=netframework-4.7.2)
* Content Source: [xml/System.Xml.XPath/Extensions.xml](https://github.com/dotnet/dotnet-api-docs/blob/master/xml/System.Xml.XPath/Extensions.xml)
* Product: **dotnet-api**
* GitHub Login: @dotnet-bot
* Microsoft Alias: **dotnetcontent**