1. A method for accessing data in a computing system, comprising: associating an index structure with a first data or a first subtree; associating the index structure with a second data or a second subtree; associating a first group with the first data or the first subtree, where access by any member of the first group against the index structure will cause access to the first data or the first subtree; and associating a second group with the second data or second subtree, where access by any member of the second group against the index structure will cause access to the second data or the second subtree.