This is an alternative way to summarize the Shared Parameter configuration for the current Revit document. This version checks through a list of family instances in the current project and attempts to get the Shared Parameter GUIDs from them, and then simply returns a list of Shared Parameter GUIDs that match the input SPnameAsString. The Boolean input TrueForType allows you to switch between checking Instance or Type Parameters. As can be seen below, the Asset Code parameter in this model has incorrectly been added twice, and there are two different GUIDs for the same Shared Parameter, which is not good J

Note: future version of this node should work on the Document level, not doing the Family Instance iteration that it does currently.