[chinookdesign]

Just a quick follow-up to this issue.
I've searched but not found the answer:
Is it OK if heading_id numbers repeat in separate files?
In other words, if there are 5 h3 headings in file1.xhtml:
id="heading_id_1"
id="heading_id_2"
id="heading_id_3"
id="heading_id_4"
id="heading_id_5"
and four h3 headings in file2.xhtml:
id="heading_id_1"
id="heading_id_2"
id="heading_id_3"
id="heading_id_4"
is that going to be a problem?

The ePub I've just finished has this going on, and it validates in FlightCrew and epubcheck. Just want to be sure I shouldn't go through and renumber them.

I haven't looked yet to see if any h1 or h2 headings share the same numbers as any h1, h2 or h3 headings in other files.
Edit: now I've checked and there are occasions where one file has an h2 with id_9 and another has an h3 with id_9.

Thanks