I know I am late to the discussion, but here are my own 2 CPs on Pages of Spell Knowledge on almost every issue raised in this thread.
With a simple analogy I think of the difference in Arcane and Divine Magic as similar to Alternating Current and Direct Current (AC/DC). Both are essential the same energy but they differ in how they are transmitted. And taking the analogy further the differences in sub-types of Arcane and Divine energies can be further differentiated like the electrical systems in different countries are by frequencies... 50 hz, 60hz, etc... Wizard Frequency, Bard Frequency, etc.
Page of Spell Knowledge: ... It contains the knowledge of a single
arcane or divine spell (chosen by the creator when the item is crafted).
So if found as a random piece of treasure its type; Arcane or Divine must first be determined... if its not part of gear on a specific caster class; then which you can reasonably assume it would be of that type.
I think the rule on UMD on the Ring of Revelation makes perfect sense. A Sorcerer trying to use a Divine Page of Spell Knowledge to cast a Cure Light Wounds could trick the item into working... But without spell slots of DC (Divine Current), the Knowledge on how to cast the spell contained in the Item are simply non aplicable and it wouldn't work.
If the Sorcerer does have levels of a Divine Caster of a high enough level then he could operate the item... Which would make the whole use of UMD likely pointless since they could just use it with their Divine Casting ability anyway... Alternately if they were a Mystic Theurge and had a Class ability to essentially convert AC (Arcane Current) to DC (Divine Current) then I would say they could use their Arcane Casting slot to power the item... if for some reason their Divine Casting was not of sufficiently high level to do so, or they had already expended those spell levels for the day and they were not available for use at the moment.
Now if the PAGE were created as a Bard spell of Cure Light Wounds I do not think a Sorcerer should be able to activate it. Yes, they both use AC (Arcane Current) but they could be said to differ in the frequency, cycles per second analogy. But I would say the Sorcerer could use UMD to duplicate a Bard's casting and on a success be able to momentarily modify the energy of his spell slot to that of a Bard's and allow the PAGE to operate. But the Sorcerer could not activate the PAGE directly with out UMD and just using his spell slots to power the item.
Vice versa, a Page containing the Knowledge of say Magic Missile; a spell not on a Bard's Spell list, but using AC (Arcane Current)... Then a Bard using UMD could also attempt to make use of the item and power the Page with their available spell slots.
In a related question on another forum here: On Pages of Spell Knowledge
For the sake of simplicity, there is no difference between an arcane and divine scroll or wand in Pathfinder Society Organized play. Thus a bard and cleric may both use the same scroll of cure moderate wounds.
Note the part, the page of spell knowledge is not a scroll or wand.
This makes sense to me. Pages are NOT scrolls or wands. The energy for those items are already provided in their creation; all that is required is a magical ability to "Flip the On Switch". For a PAGE you must provide the power and hence the difference. UMD allows you use... "turn on" a device powered by its own self contained power source. But it does not allow you to power it... Some items may allow you to "Power" them with the spell energy you possess, but that would be a function of the item, not UMD. Even though you may be using UMD to operate said item.
In regards to constructing a PAGE; from APG P. 282 the requirements... include feats, spells, and miscellaneous prerequisites such as level, alignment, and race or kind... etc.
A non caster with the Master Craftsman feat might be able to make one of these, but most likely not with out some assistance with all the penalties they are going to have.
+5 for not having the spell... I would argue having a scroll wouldn't cut it. It would provide the magical power in creating an item, but a PAGE specifically provides KNOWLEDGE so you can channel your energy to power the item. Other Wondrous Items, Wands, Rods, Staves, Scrolls, etc., are fully self contained ready to go items. PAGES are instructions in Do It Yourself.
The Master Craftsman NPC is also going to have more penalties if not a high enough Level and I would add also; not of the right Class, since they are not a caster class at all... This on top of the final line of the Master Craftsman description: You cannot use this feat to create any spell-trigger or spell-activation item... Which I would contend PAGES are.
So if its even possible for a non-caster to create a PAGE, its not going to be easy. Not without having assistance to overcome all those penalties. An NPC is not going to be cranking these out solo without a lot of failures; greatly increasing their material costs and thereby selling price or creating cursed items instead.
That said a scenario like this could occur: A party's Cleric with Craft Wondrous Item could construct a PAGE of Spell Knowledge of Cure Light Wounds for the party's Sorcerer. But it would have to be a Bard's version, and the Sorcerer would have to use UMD to activate it since no such spell exists on the Wiz/Sor list.
Having the Creation Feat already makes the Cleric high enough level, so no penalty. But they are not a Bard, so a penalty there in the conversion; unless they have a Bard to help them in the creation. Also that PAGE would now be a BARD version of Cure Light Wounds and thereby only useable by Bards... or an Arcane Caster using UMD to fake the requirements. Or possibly a Mystic Theurge or Divine Caster with a similar Theurge like ability where they can convert Divine to Arcane energy casting.
Similarly a Sorcerer could make a PAGE of Magic Missiles for a Bard that they could use with UMD... but again no such spell exists for a Cleric. So unless the Cleric has Arcane Casting Ability as well, that PAGE would be useless for them even if they had UMD.
As for the Spell-Fetch (SU) ability to power a PAGE of a spell you can't normally cast: I think that should work. But why would you? Just have the Genie bring you the spell. You don't even need a PAGE at that point... Sorcerer's with that ability can already cast such a spell for the next 24 hours as if they knew it. A Wizard might gain a slight benefit by not having to memorize it multiple times.
Mystic Past Life (SU) and Esoteric Magic (EX) seem to be a variation to a lesser degree of the Theurge ability. They give you the ability to convert the type of spell energy you posses to the opposite (AC/DC) for that SINGLE spell. If you selected such a spell and added it to your list, you don't really need the PAGE, since you can already do that without a PAGE... If you're a caster that prepares spells and you either used the spell already or didn't Memorize it for the day but now want to cast it, then a PAGE could be beneficial. But in any case, I would say you meet the qualifications to use a PAGE of that one single Spell, since it is on your Spell List. And its not overly powerful. In the case of a spell you already used a Pearl of Power would do the same thing as a PAGE in this case; albeit only once per day.
And my final thought is on concerning the use of PAGEs. I believe most everyone agrees you need them in your possession for them to work; but I would say inside a Handy Haversack, Glove of Storing, Portable Hole, etc. would not qualify. Those are extra dimensional spaces and the effect of the PAGE is not specifically stated to have transdimensional capabilities. Just as any other continuously operating item placed in such a space does not penetrate into the real world; or can be activated once inside... That said, I would definitely invest in a water-tight Mithral scroll case, sealed book or like item to protect these incredibly valuable items from damage.
So basically I would split the difference of the arguments down the middle; likely making neither side happy, but none the less a fair and rationalized compromise I believe.