I noticed earlier today when looking at cantrips for a potential character, that the list was not all inclusive. For example, the spell Vacuous Vessel was not listed, but is infact a 0th level sorcerer wizard spell. So I moseyed on over to the rare cantrips page to see if it was there. Nope. Are these missing cantrips official starting cantrips to take or are they similar to rare cantrips?
The SRD is not official, its maintained by fans, and as such, its prone to error. This is just another example of such errors. Paizo's PRD is official, though it takes longer to be updated and not every book makes it there, specially softcovers.
I will try to not repeat myself, but if a published spell says that it is on a class's spell list, then it is. This also means that they are all "legal" if your GM allows it, or if the book has been sanctioned for Society Play as a valid resource.
This also means that with every new cantrip published, new wizard characters begin with more spells on their spellbooks. As long as they research them properly and remember to write them down, as some GM's don't take "all cantrips" as a valid spellbook entry.