Per generated FHIR version, a class implementing the 
[Versions\VersionInterface](https://github.com/dcarbone/php-fhir-generated/blob/main/src/DCarbone/PHPFHIRGenerated/Versions/VersionInterface.php)
is created.  This class is always called `Version`, and exists at the root of each version-specific namespace.

For example, here is the R4 `Version` class:
[DCarbone\PHPFHIRGenerated\Versions\R4\Version](https://github.com/dcarbone/php-fhir-generated/blob/main/src/DCarbone/PHPFHIRGenerated/Versions/R4/Version.php).

This class contains version-specific configuration encoding configurations, type map, and FHIR version details.