ACTION-1506: Create editors draft of name/description computation.

First checkin.
ACTION-1506: Create editors draft of name/description computation

- First pass at making the algorithm more general in terms of
host languages:
-- removed HTML references, except as they appear in examples.
-- added SVG references.
-- reworded in terms of roles instead of specific elements.

- Editorial changes to clarify the steps.

- Added editorial comments to mark locations that need further
work.