I have to use attached diff to successfully merge. Maybe it's needed only with newer xerces (2.8.0) or something. It's adding functions from org.w3c.dom interfaces to solve "abstract class" issues. Please check it before using it.
Created attachment 90141 [details, diff] add missing functions to non-abstract classes extended from abstract ascendant
Applied to 1.6.1-r2. Thanks for contributing!