Bukkit

Introduction to NBT

Note 1: For advanced information, check this page.
Note 2: For a list of all existing NBT tags, check "Enum Constant Summary" here or type /isp types if you're ingame.

Lists

The NBT type list is a tag that can hold a various number of other tags. In iSpawner, you can access the held tags like this:

list.0
list.1
list.2
...

Note that the first element has the index 0 and not 1!
If you remove one element, the following ones are moved one index down.

Compound

The NBT type compound works like a list, but instead of an index every value has a name. Example:

compound.value1
compound.potato
compound.ActiveEffects
...

Strings

The NBT type string is simply text. You can set it like

path.to.whatever string The value you want it to have

Numbers

The NBT types byte, short, int and long are integer values with different maximum values (byte is the smallest, long the largest).
The NBT types float and double are non-integer values.
Examples:

some.path byte 123
some.other.path long max
some.nonInteger float 987.654321

Note: For all number types you can use "max" as value to insert the maximal possible value.

Bool

The NBT type bool does not exist in Minecraft, but you can use it in iSpawner and it will convert it to a 0 or 1 byte. Example:

path.0 bool true
path.1 bool yes
path.2 bool false
path.3 bool no

Note: true = yes, false = no

byte_array and int_array

The NBT types byte_array and int_array are like lists, but they have a fixed size and contain only bytes or ints. Example:

some.path byte_array 4,8,15,16,23,42
some.other.path int_array 202,254,186,190

End

The NBT type end represents the end of a tag if the tags are written to a file. iSpawner uses it to delete tags (the "-" type). So if you use this

some.path.meow end

then some.path.meow will be removed.
Yes, you can use this in txt files if you really want to (you can't use the "-" tag though).