Request for clarification of fo:inline-container alignment-point positioning

In W3C CR-XSL-20001121, section 6.6.8., the following passage appears under
the "baseline" heading:

"If the writing mode has a block-progression-direction that is parallel to
the block-progression-direction of the parent: the alignment-point is at the
position of the dominant-baseline of the first descendant line-area."

This does not explicitly state how to deal with a case in which the first
descendant line-area has a non-zero orientation with respect to the area
generated by the fo:inline-container. This could occur, for example, when
the first child of the fo:inline-container is an fo:block-container with a
non-zero reference-orientation. How is such a case intended to be handled?