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As a rule, names in a namespace cannot have more than one meaning; that is, different meanings cannot share the same name in the same namespace. A namespace is also called a context, because the same name in different namespaces can have different meanings, each one appropriate for its namespace. Following are other characteristics of namespaces:
PID namespaces are nested, meaning when a new process is created it will have a PID for each namespace from its current namespace up to the initial PID namespace. Hence, the initial PID namespace is able to see all processes, albeit with different PIDs than other namespaces will see processes with.
A Wikipedia namespace is a set of Wikipedia pages whose names begin with a particular reserved word recognized by the MediaWiki software (followed by a colon). For example, in the user namespace all titles begin with the prefix User:. In the case of the article (or main) namespace, in which encyclopedia articles appear, the reserved word and ...
namespaces, which make it possible for an identifier to have different meanings depending on its associated namespace; scopes , which make it possible for an identifier to have different meanings at different scope levels, and which involves various scope overriding and hiding rules.
Similarly, a reference to "*USR:X" would mean the file in their own library, and "MA45:X" would be a fully qualified file name referring to the specific file X in the library of user MA45. On the RSTS/E operating system on the PDP-11 minicomputer, specifying a file "X.X" would refer to a file in one's own directory.
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Replication and distribution have distinct meanings in the design and management of a directory service. Replication is used to indicate that the same directory namespace (the same objects) are copied to another directory server for redundancy and throughput reasons; the replicated namespace is governed by the same authority.
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