Internal functions to support reflection on namespace objects.
getExportedValue(ns, name)
getNamespace(name)
getNamespaceExports(ns)
getNamespaceImports(ns)
getNamespaceName(ns)
getNamespaceUsers(ns)
getNamespaceVersion(ns)string or namespace object.
string or name.
getExportedValue returns the value of the exported variable
  name in namespace ns.
getNamespace returns the environment representing the name
  space name.  The namespace is loaded if necessary.
getNamespaceExports returns a character vector of the names
  exported by ns.
getNamespaceImports returns a representation of the imports
  used by namespace ns.  This representation is experimental
  and subject to change.
getNamespaceName and getNamespaceVersion return the name
  and version of the namespace ns.
getNamespaceUsers returns a character vector of the names of
  the namespaces that import namespace ns.
loadNamespace for more about namespaces.