a required model that the address space already holds, from an earlier call or from an
earlier registerNamespace: satisfied when the namespace is registered with a version at
least the required one. A lower version is an error naming both versions; an absent
namespace is not satisfied, and left to the caller to report as missing.
a required model that the address space already holds, from an earlier call or from an earlier
registerNamespace: satisfied when the namespace is registered with a version at least the required one. A lower version is an error naming both versions; an absent namespace is not satisfied, and left to the caller to report as missing.