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A .spec is similar to a Makefile. When you install an application from tarball it (usually) doesnt automagically install the Makefile. When you make a rpm from spec it doesnt include the spec file. So, no there isnt any way. Any reason why you would need that?
I want to get these information in terms of package names (as in debian) and not in terms of capabilities. Is there any way to do so?
What you could do after you -q --requires is resolve capabilities to filenames, then query the rpm db for the package the filenames are in (using queryformat tag for names). Since rpm doesn't need to resolve capabilities like you want to, depending on how you resolve capabilities it will either be rather CPU/IO intensive or less accurate.
Binary rpm archives *do* contain the spec file -it's written into the header of the archive. rpm needs them so that it can extract any postinst scripts etc which are needed for the package. If you open an rpm in a hex editor you can see the text contents of the spec file close to the top.