The following describes the most significant changes which
occurred in the AST library between versions V9.1.3 and V9.2.0:
- - A new subclass of ChannelChannel called YamlChanYamlChan has been added. It allows AST
objects to be read and written using YAML. Currently, the ASDF format
developed by STSci (https://asdf-standard.readthedocs.io) is the only
supported encoding.