Get Release Table Trees

Get release table trees for a given release. You can go directly to the tree structure by passing the appropriate element_id. You may also use a drill-down approach to start at the root (top most) element by leaving the element_id off. Note that release dates are published by data sources and do not necessarily represent when data will be available on the FRED or ALFRED websites. This request can return either XML or JSON by setting the file_type parameter to xml or json. Note that the default value of file_type is xml.