The Wood Bond power from the oracle's wood mystery says that "you gain a +1 competence bonus on attack rolls when wielding a weapon made of or mostly consisting of wood (such as a bow, club, quarterstaff, or spear)." So in terms of martial weapons, how much wood counts as "mostly consisting of wood"? Since spears are listed in the description, should most polearms fall under that category too? What about weapons like greataxes or longaxes, which have long wooden hafts, or weapons like the tetsubo, which are wood "shod in metal"? (And in terms of simple weapons, if bows are fine, would crossbows also work with the power?)
Is this totally up to GM fiat, you think, or is there some reasonable category of weapons that could fall under the wood bond power?