Gets a XamlDirective for the PositionalParameters directive from XAML.
Assembly: System.Xaml (in System.Xaml.dll)
PositionalParameters is a directive that wraps the multiple objects that can be specified as a set of object nodes for input of a markup extension. See [MS-XAML] Section 6.6.7.
If you are looking at raw node interpretations or visualizations, PositionalParameters is sometimes seen in string form as _PositionalParameters (note the leading underscore) and is within the XAML language XAML namespace (as notated by a preceding Namespace node).