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Reading closer, this is what TypeException is for. TypeException will be thrown if the id is not of the proper type (resource or collection).
Jun. 2, 2006
Updated CH page with notes on identifiers. Since both resources and collections can be directly accessed from the ContentHostingService, identifiers will have to include full path names. The current content hosting service doesn't seem to have the concept of an active directory, though this might be present in the Resource Tool.
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.