How does yum decide rpm A to depnd on B?

Hi,

I notcied yum repo has a xml file primary.xml, that provides what a rpm
requires and what a rpm provides, optionally, yum repo can also have a
sqlite database primary.sqlite which has similar info to primary.xml, I
want to decide dependency according to xml file or sqlite database, my
decision logic is A requires B and C provides C, then A depends on C, I
don't know if this logic is correct, I don't know how to decide the real
dependency logic, anybody know it?

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