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Started working on CHService.getCollection() starting with getting the root collection. Eventually the root will be relative to some context (site), but for now it is hard wired.
Added an FSCollection constructor that takes a File. Implemented CHService.getCollection() to create a File based on a root and the id passed. Added a small piece of code to ContentTool to test this and it works in that it returns "fsroot", the name of the directory designated as the root directory.
Under fsroot is another directory called test. Modified ContentTool code to access the test directory by passing "/test" as the identifier. This returns an id of "test". Note the problem in these identifiers: they can be passed back to the ContentHostingService to get the collections again. The path relative to the root need to be prepended.