HTML+RDFa 1.1 - Section 7, Step 5/6 Modification Clarification

The HTML+RDFa 1.1 spec says:

"In Section 7.5, processing step 5, if no IRI is provided by a resource
attribute (e.g., @about, @href, @resource, or @src), then first check to
see if the element is the head or body element. If it is, then set new
subject to parent object."

and

"In Section 7.5, processing step 6, if no IRI is provided by a resource
attribute (e.g., @about, @href, @resource, or @src), then first check to
see if the element is the head or body element. If it is, then set new
subject to parent object."

but step 5 has two parts.  It is unclear how each part is modified:

1. Do you all mean that the new subject is only set if the element is
'head' or 'body'?
2. In 5.1 and 5.2, the final default for the new subject is the value of
the parent object.

Also, for step 6, the default is already the parent object.

I'm really not understanding what you all are after here.

-- 
--Alex Milowski
"The excellence of grammar as a guide is proportional to the paucity of the
inflexions, i.e. to the degree of analysis effected by the language
considered."

Bertrand Russell in a footnote of Principles of Mathematics