review, update TODO

DFDL/attribution/README.md

@@ -60,7 +60,8 @@ Diagrams for XML test examples compare element-attribute to element-only forms u
 
 ## TODO
 
-* Improve DFDL markup definitions and handling in examples.
+* Further document this approach with a slideset.
+Improve DFDL markup definitions and handling in examples.
 * Continue with round-tripping of example XML documents to/from DFDL data.
 * Add further structural-validity checks in conversion stylesheets and schemas.
 * Create Ant macros for simple pipeline repeatability across multiple data formats.