SpellArg

:;
Spellbook args  
:;index: - Spellbook slot index, ranging from 1 through the total number of spells across all tabs and pages.
:;bookType: - BOOKTYPE_SPELL or BOOKTYPE_PET depending on if you wish to query the player or pet spellbook.
:::Internally the game only tests if this is equal to "pet" and treats any other string value as "spell".