For all of the axes that DPath does not support (ancestor, following, etc.) I am getting the error message:

Schema Definition Error: Unable to parse expression. Message: `}' expected but `:' found

This may change after the valid long form axes are implemented (DFDL-1059) but wanted to note this just in case.

See tests:
test_ancestor_axis_01
test_ancestor_or_self_axis_01
test_attribute_axis_04
test_descendant_axis_01
test_descendant_or_self_axis_01
test_following_axis_01
test_following_sibling_axis_01
test_namespace_axis_01
test_preceding_axis_01
test_preceding_sibling_axis_01

In files:
daffodil-test/src/test/resources/edu/illinois/ncsa/daffodil/section23/dfdl_expressions/expressions.tdml
daffodil-test/src/test/scala-debug/edu/illinois/ncsa/daffodil/section23/dfdl_expressions/TestDFDLExpressionsDebug.scala