Goal: Create a long outline and automatically produce a (condensed) table of
contents from the top two levels of the outline.

Approach: Use conditional paragraph styles for the outline items and configure
the table of contents (ToC) to pick up the styles applied at the top two levels
of the outline list.

That should allow the ToC to pick up the desired items from the outline.

Problem: The ToC does not pick up the conditional styles; none of the items
appear in the ToC.

If the conditional style is applied manually to an outline item, then it is
picked up by the ToC.