Back in 1998 the J18 committee charged with developing Rexx standards did some work on an
Object REXX draft specification.
The key part of the new charter was:
The scope of the standard will be that of the existing standard plus consideration of extensions that have evolved in recent years. In particular the ability to work in an 'Object Oriented' way with both objects created by Rexx programs and objects not created by Rexx programs will be in the scope.