Well, there are two hard problems in computer science, cache invalidation, naming things and off-by-one errors. Extensions aren't bad, but you need to find the

Well, there are two hard problems in computer science, cache invalidation, naming things and off-by-one errors. Extensions aren't bad, but you need to find them in the first place, and if all you've got is a single, non-hierarchical identifier... I'm aware that more elaborate namespaces like e.g. CPANs also can cause confusion, i.e. if they're not followed and you end up with modules all across the tree, but with a bit of community support the benefits still could outweigh this.