Bukkit

LimitUsage: # Disallows the usage of the configured items (for ex. weapons)
  StoneAxe:
    id: 275
    subid: -1
LimitInteract: # Disallows the interaction with the configured blocks (for ex. breaking)
  Obsidian:
    id: 49
    subid: 0
Classes:
  example: 
    name: Example
    desc: Description of Class
    perm: Required Permission Node
    gain: # Elements, how the class can be leveled
      by1:
        for: place # See List above
        amount: 1 # XP for this event
        level: 0 # From which level will this event fire (optional)
        itemid: 5 # which ID (optional)
        itemsubid: 0
      by3:
        for: destroy
        amount: 1
      by2onlywithdiamond: # example will only trigger if wood is destroyed with a diamond axe
        for: destroy.5
        amount: 2
        level: 10
        itemid: 279
        itemsubid: 0
      commandkill:
        for: chat.command
        amount: 1
        level: 10
        param: /kill # Param - for ex: names (click.player) or animals or commands.
    skills: # these are the skills the player will gain over time. There is no limitation
      first:
        name: Use.StoneAxe
        level: 1
        perm: use.275.-1
        desc: You can use the stone axe
        price: 0
      second:
        name: Destroy.Obsidian
        level: 2
        perm: interact.49
        desc: You can now interact with obsidian
        price: 5

    use.ITEMID.SUBID (-1 for all) - allows the usage of Items added in LimitUsage Config
    interact.ITEMID.SUBID (-1 for all) - allows to interact with items added in LimitInteract Config
    classes.boostxp.[5/10/20/25/30/50/70/100] - gives additional % XP to the player
    effect.boost.[1-20] - gives the player additional hearts
    effect.boost.add.[1-5] - even some more hearts. 
    effect.shield.[1-20] - gives the player absorb hearts
    effect.haste.[-1/0/1] - gives haste buff to the player
    effect.nightvision - gives the player permanent night vision
    feed.ANIMAL (for ex. Chicken, Cow,...) allows feeding of the specified animal.

    classes.select:
        description: player can select classes
    classes.active:
        description: player can use classes
    classes.feed:
        description: player can feed every animal
    classes.nolimit:
        description: player can use every item
    classes.admin:
        description: player is admin
    classes.brew:
        description: player can use the brewing stand


Player gets the following permissions:* 
    class.CLASSNAME (if he owns the class)
    class.CLASSNAME.LEVEL 
    class[1-3].empty (if he did't select a class)