Release of SBOL Data Model 2.2.1

The latest version of the SBOL data model corresponding to version 2.2.1 has just been released.
All significant changes for this version are marked with a 2.2.1 label in the margin near the change (minor typo fixes may not be noted). These changes include:

1) A new TopLevel UML diagram that includes all new TopLevel classes.
2) A clarification on ontology terms for roles for proteins and small molecules.
3) A best practice for annotation of authorship.
4) A new example showing how Prov-O should be used for designs derived from CombinatorialDerivations.
5) A lot of corrections to the validation rules.

The new specification is available for viewing here.
A full list of issues that were resolved in this release are located here.