Kevin Futter wrote:

I see breadcrumbs as a complete unit - just as a file path is a complete unit; 
take out a component and you render it useless.

Breadcrumbs and sentences are both whole units, but units of what? Since their component parts are of a different nature, the resulting mark-up should also be different.

The fact that each breadcrumb unit is hyperlinked to the resource it represents 
is less important in my view than the fact that they clearly show where you are 
in the document hierarchy.

"Less important" doesn't mean "not important."

And therein lies the rub: lists are one-dimensional, as you yourself point out
elsewhere; breadcrumbs attempt to represent a path across the document 
hierarchy, whereas lists imply, and are taken to imply, that each element 
exists on the same hierarchical plane.

Not ordered lists. The fact that they are ordered gives them a hierarchy.

I disagree - there is profound meaning in a single word,

Out side the context of a sentence you can't even tell what part of speech it is. Is "rose" a noun, verb, or adjective? The answer is it depends on the context. As Rose rose to pick the rose, she dropped her rose colored glasses.

but we're definitely off-topic for web standards now!

Perhaps, except semantics are important to Web standards.

But as I said earlier, I'm not so interested in the individual breadcrumb 
components, linked or not, as I am in the breadcrumb unit as a whole.

As sentences are made up of words, breadcrumbs are made up of links; the difference is in the value of the parts to the whole.


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