Path

Resource types	Projects, Tasks, Task sets, Folders, Attachments, Test cases, Translation Jobs, Products, Costs, Invoices, Communicator Templates, Work flows, Reports, Report templates, Report style sheet, Reports, Monitors, Dashboards, Tabulation scripts, Questionnaires, Questionnaire templates, Layout templates, Layouts, Sample requests, Sites, Export jobs, Hall test machines, Data caches
Data types	Resource reference
Effect	When filter is applied but no string inserted (value is null) then the filter will not be used for the query. When filter is applied and a resource is chosen then only resources in that path or sub paths of that path will be included in the returned array.
Example

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