According to Satipatthana Mula (By Sujato Bhikkhu edited by Piya Tan) Dharmaskandha references 6 elements that the traditional 4 elements in Theravada. They are not explicitly mentioned in the text. What are these elements? What are the citation for this in English? Does this coincide with the 6 elements in the Theravada Abhidhamma?
I'm not sure if there're English versions out there. Anyway, Chapter 9 of the Dharmaskandha's Chinese version, the Foundations of Mindfulness, refers to the same Mahabhuta as the Pali version: earth, water, fire, wind, space, and consciousness. ("唯有種種地界水界火界風界空界識界。如是思惟諸界相時。")