Depends on what you mean by available.
They're in the daffodil source tree.
The daffodil-test module is a big suite of tests, organized by section numbers
of the DFDL spec,
all expressed as TDML.
https://github.com/apache/daffodil/tree/master/daffodil-test/src/test/resources/org/apache/daffodil
Unfortunately, the section numbers evolved and no longer match the final DFDL
spec., but most are the same.
From: Attila Horvath
Sent: Thursday, June 17, 2021 1:30 PM
To: dev@daffodil.apache.org
Subject: test cases - examples
ALCON
I assume there is a repository of test cases with which to validate and
regression test various corresponding daffodil features.
Are these test cases available to users for reference as examples?
Thx
Attila