This class represents a YAML sequence.
A YAML sequence is basically a list, and looks like this:
%YAML 1.1 --- - I am - a Sequence
A YAML sequence may have an anchor like this:
%YAML 1.1 --- &A [ "This sequence", "has an anchor" ]
A YAML sequence may also have a tag like this:
%YAML 1.1 --- !!seq [ "This sequence", "has a tag" ]
FLOW = 2
BLOCK = 1
ANY = 0
The sequece style used
Is this sequence started implicitly?
The tag name for this sequence (if any)
The anchor for this sequence (if any)