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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 namespace name is a uniform resource identifier (URI). Typically, the URI chosen for the namespace of a given XML vocabulary describes a resource under the control of the author or organization defining the vocabulary, such as a URL for the author's Web server.
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.
A Uniform Resource Name (URN) is a Uniform Resource Identifier (URI) that uses the urn scheme.URNs are globally unique persistent identifiers assigned within defined namespaces so they will be available for a long period of time, even after the resource which they identify ceases to exist or becomes unavailable. [1]
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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.
Notes: Precinct data not yet available for Connecticut districts. Some Virginia voting districts are split, meaning that some precincts fall in two districts. The full precinct is counted here in the general election results when part of the precinct falls within the district because they are not further broken down.