Re: Outline a header

I am using/reading xPath from O'reilly and i got that snippet from there.

Books have errors.
In your case: the FO spec doesn't even define well how a *single* leader
should be handled properly. There is a sort of recommendation that
leader-length.optimum (default: 6pt) should be used to determine line
breaking, but other than that, as long as the length is between the
minimum (default: 0) and the maximum (default: 100% of the content area
width). It gets worse for two leaders, the processor would be allowed
to expand the first leader so much that the "Hmm" goes to the right
end of the line and "Page" goes to the next line.

There's quite a chance that the book author didn't try the code snippet
with one FO processor, not to mention several different.