Add a (rightmost) child to this node
since2.7.3 Need for error handling
Get the first child of this node; null if no children
Get the next sibling in line after this one
Get number of children of this node; if leaf, returns 0
Get the token text for this node
Get the token type for this node
Set the first child of a node.
Set the next sibling after this one.
Set the token text for this node
Set the token type for this node