https://learn.microsoft.com/pt-pt/dotnet/api/system.xml.xsl.xsltcontext.resolvevariable?view=netframework-4.8.1
XsltContext.ResolveVariable(String, String) Method (System.Xml.Xsl) | Microsoft Learn
When overridden in a derived class, resolves a variable reference and returns an IXsltContextVariable representing the variable.
stringmethodsystemxmlxsl