I am afraid that a conversation with the Technical Committee is not possible under OASIS rules for the reasons set forth here.
When members join OASIS and sign our Membership Agreement, they agree to be bound by the OASIS IPR Policy (https://www.oasis-open.org/policies-guidelines/ipr
) and then again, when they join a Technical Committee they agree to be bound by the specific IPR mode chosen by the TC (Royalty Free on Limited Terms in the case of UBL). By these agreements, they grant OASIS and the TC certain rights with respect to their IP contributions and their participation that, downstream, provide implementers with assurances that they can safely use the resulting specification.
People outside OASIS have made none of these commitments. That is why we require feedback to be provided through the comment facility, in the case of UBL, the ubl-comment@ mailing list. People are notified as part of the subscription process that they are agreeing that the committee can use their feedback under the same rules. (This is part of the reason that we can't accept links as submissions. There is no straightforward way to know in the future what exactly was contributed as feedback at a particular point in time.)
The only ways to directly interact with the committee are either through the comment facility or to join the TC so as to make the necessary commitments.
I appreciate this sounds bureaucratic, especially as you are working in an open source project, but it is how we have to do things in order to protect our TCs and the work they produce under our program of governance.