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The subjects can be users, roles, and groups by proper specialization of the Subject class. Roles and groups can be structured recursively [FP01] that is, there can be role and group hierarchies that permit more flexibility in the assignment of rights. The protection objects can be single files, directories, or recursive structures of directories and files. Most operating systems use read/write/execute as access types, but higher-level types of access are possible. For example, a file representing students in a university could be accessed with commands such as list, order alphabetically, and so on. Implied authorization is possible: for example, access to a directory may imply a similar type of access to all the files in the directory [Fer94]. This approach allows an administrator to write fewer authorization rules, because some access rights can be deduced from others. Workstation access is also controlled and workstations can be homes for directories. This is a conceptual model that doesn t restrict implementation approaches. Workstation authorization is separated from file authorization, and systems that do not need workstation authorization can just ignore the relevant classes. In some operating systems, for example Inferno [Rau97], all resources are represented as files. Other systems represent resources by objects with ACLs. This means that this pattern could be used to control all the resources of the operating system.

The following potential liabilities may arise from applying this pattern:

Implementations of the pattern are not forced to follow the access matrix model. For example, Unix uses a pseudo-access matrix that is not appropriate for applying the need-to-know policy. However, constraints can be added to the pattern to force all the instances of the pattern to conform to an access matrix model. Typically, access permissions are implemented as Access Control Lists (ACLs).

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Part cheerleader, part showman, and part herder are all skill sets called upon by the successful group photographer. Group photography can mean taking pictures of couples, families, or entire companies. With more subjects to arrange comes more responsibility to make everyone look good. Added to that is the challenge of getting everyone s attention, balancing the pose, and shooting quickly. Nobody likes to stand around for a group photo while the photographer messes around with the gear. When setting up for groups, it s advisable to show up early, look for a good background, and shoot some tests before anyone arrives so you ll be ready to go when they do. It s a good idea to be really clear on where the pictures are supposed to be taken and make sure you have permission to be at the location. I can t tell you the number of times I have been all set up to shoot a team portrait and sprinklers came on automatically, soaking everything, or a few ball teams showed up at the last minute demanding to use the eld for their scheduled game. Plan ahead. Geometric patterns, such as a diamond or triangular shape, work well when shooting a few people, but after that it s a challenge to be creative with lots of bodies in the picture. Depending on the end result for the photo s use, I have staged pyramids of cheerleaders, pig piles of soccer and volleyball players, and goofy shots of softball and basketball teams after the standard vanilla pictures were taken, to the great delight of the participants.

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1. The prices will sink from there. 2. Prices will sink brie y, recover to touch the underside of what used to

[Gol99] and [Sil03]. These are data structures associated with a file in which each entry defines a subject that can access the file and its permitted access modes. The pattern models the entries of the ACLs but not the fact that they are associated with the file components.

Other aspects of using this pattern include:

Some systems use the concept of Owner, who has all rights on the files they create. The Owner in this model corresponds to a special type of subject. When roles are used, there are no owners and when groups are used, ownership is not inherited in subgroups. In some systems, files are mapped to the virtual memory address space. The pattern still applies to this case, although a more uniform solution is then possible (see CONTROLLED VIRTUAL ADDRESS SPACE (339)). In some systems, the directory is not strictly a tree, because it is possible to have links between files in different subtrees [Sil03]. Modeling this case would require adding some associations to the model shown in the figure AUTHENTICATOR (324).

6.31 A simple direction Look at Dad prompted the warm expressions in this family portrait. Taken at ISO 400, f/5.6, 1/200 second with a 26.1mm lens setting.

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