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Guidebooks/Databooks fall under secondary canon rulesStandard site procedures says that any guide statements, especially cosmology ones, should have some support from the source material, no?
A databook can be used as valid evidence without supporting scans from series, it just can't be used if scans from primary canon contradict the claim its making (EDIT: As an example this guidebook claim that Superman's reactions = speed has no contradicting elements while this one saying Orochimaru's snake summon counters all defense has dozens of contradicting elements and can't be used)Canon is a term used to designate works that are generally accepted as the genuine work that apply to the fictional verse. With few possible exceptions only canon material is featured in the character pages, with non-canon material to be ignored.
The generally agreed-upon definition is that the work by the original author and creator of the fictional setting is canonical, unless the author or the copyright holder declares otherwise. Few other exceptions are also possible and should be noted on the verse page.
The primary canon is the source material first released (with few possible exceptions), with the other author works being secondary canon.
When different source materials give different versions of the same feat, and by that they contradict each other in the depiction of the feat, the primary canon takes precedence over the secondary canon.
If the feat is correctly depicted over multiple canons any of these can be used to judge the feat. Should different results be reached by judging the feat through multiple canons, the result of the primary canon will have priority.
So for most manga series, that means the original manga is canonical, while the anime is not (since the anime is simply an adaptation of the manga made by others). Databooks are considered secondary canon since scans tend to contradict them. It should be noted that this is often evaluated on a case-by-case basis.