Public static generator functions for das2 federated catalog node objects.
Kind of like traceroute, try to resolve successively longer paths until you get to one that fails. For filesystem type URLS (http:, file:, etc.) this is the same as getNode().
Get a node from the global node map by URL. This function tries to load and return the node for the given URL. If the file portion of the node is a recognized filesystem type then that exact URL is attempted. For example: https://space.physics.uiowa.edu/juno/test/random_source.data would trigger a filesystem type lookup that expects an exact match. While a URL such as: tag:das2.org,2012:test:/uiowa/juno/random_collection/das2 For space savings, tag:das2.org,2012: may be left off of the given URLs. If nothing can be matched, null is return. The resulting parsed node is saved in a cache to avoid repeated network traffic.