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coords
[~]<x>,[~]<y>,[~]<z> ^<sway>,^<heave>,^<surge>
represents a position in the world with comma-seperated coordinates.
prefixing with ~ specifies a coordinate whose value is relative to the most relevant object (usually either the player's feet or their selection). these relative components can be intermixed with absolute ones.
prefixing with ^ specifies a coordinate whose value is relative and whose axes are based on the player's look direction. these look direction relative components cannot be intermixed with any other type.
block
<id>[:<meta>]
represents a block of a specific type.
id can be provided as an integer ("1") or a translation key ("stone"). meta is provided as an integer.
the special key "air" can be used as an alias for id 0.
axis
X|Y|Z|^
represents a specific coordinate axis.
^ specifies the axis the player is looking in.
direction
N|E|S|W|U|D|^
represents a specific direction.
^ specifies the direction the player is looking in.